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Groups > comp.lang.c > #90035

Re: double free

From James Kuyper <jameskuyper@verizon.net>
Newsgroups comp.lang.c
Subject Re: double free
Date 2016-07-05 11:13 -0400
Organization A noiseless patient Spider
Message-ID <nlgiqt$k6k$1@dont-email.me> (permalink)
References <d5964270-015f-4955-9f7a-6a06bcfb5944@googlegroups.com>

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On 07/05/2016 05:38 AM, G G wrote:
> the code fragments come from Understanding and Using C 
> Pointers. pp. 48 - 49
> 
> int *pi = (int*) malloc(sizeof(int)); 
> *pi = 5;
> 
> free(pi);
> ...
> free(pi);
> 
> the author explains this creates a runtime error
> 
> ------------------
> 
> p1 = (int*) malloc(sizeof(int));
> int *p2 = p1;
> 
> free(p1);
> ...
> free(p2);
> 
> also this creates a runtime error.
> 
> so there is no check to see if another variable is
> pointing to that location in memory before it is freed?

No. That would require free() to be far slower than it normally is.

The standard merely specifies that the behavior is undefined, but I
think it might help you to have some basic idea of how malloc() and
free() can be implemented, so you understand why it's undefined. The
implementation I describe below is based upon my memory of the first
edition of K&R C. It is a very simple implementation, more sophisticated
ones exist. However, the C standard was written to allow implementations
as simple as this one, and most implementations I know of will radically
malfunction at the second free(pi) for reasons similar to the reason
that this implementation will. Note: it's been three decades since I
last read that chapter of K&R, so I won't be surprised if I get some of
the details wrong. I'll try to be vague enough to cover up at least some
of my memory lapses.

The heap is divided into blocks with a fixed size that is a multiple of
the strictest alignment requirement. The heap is divided into regions,
each containing an integer number of blocks, with each region being
either free or allocated. Each region has a header stored at the
beginning of region. Among other things the header might contain is the
size of the region. Each free region's header also contains a pointer to
the start of the next free region (or possibly just a block index).
There is a pointer outside of the heap that points to the first free region.

When you call malloc(), it rounds the requested space up to a multiple
of the block size, and then adds to that number the size, in blocks, of
the header that is stored at the beginning of each allocated region. It
searches the free list for the first block that is large enough to hold
the requested allocation. It returns a null pointer if it can't find one.

It removes the selected region from the free list. If there's enough
room in the selected region, malloc() splits it into two regions: one to
serve for this allocation, and a new free region, which is added to the
free list.

It fills in the header for the allocated region with, among other
things, the size of the allocated region in blocks. It returns a pointer
to the first block after the header.

free() takes the pointer it is given, assumes that it is a valid pointer
to the first block of a currently allocated region. It moves it
backwards far enough to point at the corresponding header. It uses the
size information in the header to locate the start of the next region.
If that region is free, it removes that region from the free list, and
merges the two regions together as a single new free region. The region
is then added to the free list. It could then look for the previous free
region (which would require the free region header to be a doubly-linked
list), so it can merge them, too.

The key point here is that the information about each region on the heap
is stored at the beginning of that region, and nowhere else. If you pass
free() a pointer, it just assumes without checking whether it's a valid
pointer. It just assumes that it will find the header for an allocated
region at a fixed negative offset from that pointer. If there is not, in
fact, such a header, things can go very wrong, very fast.

Other more sophisticated implementations will fail in different ways,
but few (if any) implementations of malloc() and free() that I've ever
heard of work by keeping a list of currently valid pointers, and
searching that list for a match. Without such validation, attempting to
free() a block that has already been free()d is virtually guaranteed to
fail catastrophically.

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double free G G <gdotone@gmail.com> - 2016-07-05 02:38 -0700
  Re: double free Ian Collins <ian-news@hotmail.com> - 2016-07-05 21:45 +1200
    Re: double free Eric Sosman <esosman@comcast-dot-net.invalid> - 2016-07-05 07:08 -0400
    Re: double free G G <gdotone@gmail.com> - 2016-07-05 16:41 -0700
  Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-05 10:50 +0100
  Re: double free BartC <bc@freeuk.com> - 2016-07-05 11:06 +0100
    Re: double free BartC <bc@freeuk.com> - 2016-07-05 19:07 +0100
  Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-05 12:16 +0000
    Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-05 13:57 +0100
      Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-05 08:43 -0700
    Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-05 14:57 +0100
      Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-10 18:49 +0000
    Re: double free G G <gdotone@gmail.com> - 2016-07-05 17:03 -0700
      Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-05 17:25 -0700
    Re: double free Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-07-06 19:09 +0000
      Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-06 15:22 -0400
        Re: double free Nobody <nobody@nowhere.invalid> - 2016-07-09 06:13 +0100
          Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-09 10:16 -0400
            Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-09 08:58 -0700
              Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-09 13:28 -0700
              Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-11 10:41 +0000
            Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-09 20:27 +0200
              Re: double free "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-07-09 11:31 -0700
              Re: double free Gareth Owen <gwowen@gmail.com> - 2016-07-09 20:14 +0100
              Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 15:34 -0400
                Re: double free jameskuyper@verizon.net - 2016-07-09 14:02 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-09 14:10 -0700
                Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-09 17:14 -0400
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-09 14:24 -0700
                Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-09 17:31 -0400
                Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-09 20:50 -0400
              Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-09 15:50 -0400
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-10 11:32 +0200
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-10 16:01 -0400
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-11 10:07 +0200
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-11 08:15 -0400
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-11 06:53 -0700
                Re: double free Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-11 10:35 -0600
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-11 09:48 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 11:02 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 11:01 -0700
                Re: double free Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-11 13:03 -0600
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 10:57 -0700
                Re: double free albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-11-27 13:29 +0100
                Re: double free Melzzzzz <mel@zzzzz.com> - 2016-11-27 14:07 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-10 13:05 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-10 05:31 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-10 13:42 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-11 01:07 +0100
              Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-09 13:39 -0700
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-10 11:53 +0200
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-10 04:11 -0700
                Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-10 08:47 -0400
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-10 16:05 -0400
              Re: double free Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-09 17:43 -0600
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-09 17:32 -0700
                Re: double free Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-09 20:34 -0600
              Re: double free Jorgen Grahn <grahn+nntp@snipabacken.se> - 2016-07-10 06:25 +0000
                Re: double free supercat@casperkitty.com - 2016-07-11 08:02 -0700
              Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-11 11:01 +0000
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-11 04:07 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 12:17 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-11 04:59 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 13:07 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 13:38 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 14:11 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 18:54 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 11:09 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 19:47 +0100
                Re: double free Ike Naar <ike@iceland.freeshell.org> - 2016-07-11 19:08 +0000
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-11 21:19 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 21:34 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 13:48 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-11 22:49 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 23:20 +0100
                Re: double free Udyant Wig <udyant.wig@gmail.com> - 2016-07-12 10:26 +0530
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-11 22:34 -0700
                Re: double free Ike Naar <ike@iceland.freeshell.org> - 2016-07-12 06:39 +0000
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-12 00:41 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 08:57 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-12 01:16 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 09:27 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 11:48 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 08:46 +0100
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-12 10:42 +0200
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 09:59 +0100
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-12 12:46 +0200
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 09:08 -0700
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-12 18:51 +0200
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 11:28 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 19:53 +0100
                Re: double free supercat@casperkitty.com - 2016-07-12 12:19 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 14:26 -0700
                Re: double free Ken Brody <kenbrody@spamcop.net> - 2016-07-12 11:00 -0400
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 16:18 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 08:44 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-12 09:24 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 17:34 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-12 09:52 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 09:40 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-12 18:22 +0100
                Re: double free Gareth Owen <gwowen@gmail.com> - 2016-07-13 18:33 +0100
                Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-13 14:00 -0400
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 19:16 +0100
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-18 09:15 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-18 09:04 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-18 11:10 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-20 08:52 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-20 09:36 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-21 18:23 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 08:42 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 11:24 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-12 11:52 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 13:18 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-12 16:42 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-12 17:21 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 09:35 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-12 18:08 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-12 18:14 +0100
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-18 10:01 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-18 18:20 +0100
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-21 09:26 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-21 18:57 +0100
                Re: double free Udyant Wig <udyant.wig@gmail.com> - 2016-07-22 23:41 +0530
                Re: double free BartC <bc@freeuk.com> - 2016-07-22 19:47 +0100
                Re: double free supercat@casperkitty.com - 2016-07-22 11:58 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-22 12:03 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-22 20:26 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-22 13:12 -0700
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 08:57 +0000
                Re: double free BartC <bc@freeuk.com> - 2016-07-23 10:21 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-23 11:08 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-23 12:36 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-23 07:14 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-23 16:41 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 19:17 +0000
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-23 20:42 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-23 12:51 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-23 21:50 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-23 14:17 -0700
                Re: double free luser droog <luser.droog@gmail.com> - 2016-07-23 15:53 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-23 20:55 -0700
                Re: double free luser droog <luser.droog@gmail.com> - 2016-07-23 22:21 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 10:35 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-24 02:55 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-24 04:05 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-24 14:03 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 14:24 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 15:15 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 16:01 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-24 11:36 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 19:52 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-24 12:14 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-24 11:13 -0700
                Re: double free Martin Shobe <mashobe9@gmail.com> - 2016-07-24 14:52 -0500
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-25 09:59 -0700
                Re: double free Martin Shobe <mashobe9@gmail.com> - 2016-07-25 19:32 -0500
                Re: double free supercat@casperkitty.com - 2016-07-25 07:39 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-24 10:55 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-24 08:30 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-23 11:11 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-23 12:39 -0700
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 20:25 +0000
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-22 12:51 -0700
                Re: double free supercat@casperkitty.com - 2016-07-22 13:18 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-24 08:23 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-24 19:36 +0100
                Re: double free albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2016-12-02 10:21 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-12-02 10:57 +0000
                Re: double free BartC <bc@freeuk.com> - 2016-12-02 12:33 +0000
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-12-02 14:07 +0100
                Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-12-02 10:19 -0500
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-12-02 08:56 -0800
                Re: double free "James R. Kuyper" <jameskuyper@verizon.net> - 2016-12-02 12:31 -0500
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-12-02 11:42 -0800
                Re: double free supercat@casperkitty.com - 2016-07-12 08:46 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 09:16 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-12 09:27 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 08:20 -0700
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-12 12:47 -0400
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-12 22:21 +0000
                Re: double free BartC <bc@freeuk.com> - 2016-07-12 23:27 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-12 16:28 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-13 00:23 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 08:43 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 11:21 +0100
                Re: double free Jean-Marc Bourguet <jm@bourguet.org> - 2016-07-13 12:56 +0200
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 12:35 +0100
                Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-13 10:34 -0400
                Re: double free Cal Dershowitz <cal@example.invalid> - 2016-07-15 05:57 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 11:17 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-13 04:30 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 12:33 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 13:41 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 13:57 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-13 06:10 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 20:08 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 15:11 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 18:14 +0100
                Re: double free Jean-Marc Bourguet <jm@bourguet.org> - 2016-07-13 19:20 +0200
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 18:24 +0100
                Re: double free Robert Wessel <robertwessel2@yahoo.com> - 2016-07-15 00:51 -0500
                Re: double free luser droog <luser.droog@gmail.com> - 2016-07-15 02:18 -0700
                Re: double free "Osmium" <r124c4u102@comcast.net> - 2016-07-15 07:12 -0500
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-15 13:14 +0100
                Re: double free Rosario19 <Ros@invalid.invalid> - 2016-07-18 09:28 +0200
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 18:43 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 20:15 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 21:14 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-13 13:24 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 21:50 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 19:21 +0000
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-13 13:02 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 21:34 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-13 13:51 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-13 22:22 +0100
                Re: double free Robert Wessel <robertwessel2@yahoo.com> - 2016-07-15 01:08 -0500
                Re: double free Reinhardt Behm <rbehm@hushmail.com> - 2016-07-15 17:33 +0800
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-15 05:02 -0700
                Re: double free Reinhardt Behm <rbehm@hushmail.com> - 2016-07-15 21:15 +0800
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 14:48 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-15 08:02 -0700
                Re: double free Cal Dershowitz <cal@example.invalid> - 2016-07-18 01:42 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-18 03:07 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 22:01 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 22:14 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-13 14:31 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 23:03 +0100
                Re: double free "Osmium" <r124c4u102@comcast.net> - 2016-07-13 17:53 -0500
                Re: double free supercat@casperkitty.com - 2016-07-13 16:18 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-13 16:19 -0700
                Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-13 22:44 -0400
                Re: double free Jean-Marc Bourguet <jm@bourguet.org> - 2016-07-14 09:44 +0200
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-13 17:07 -0700
                Re: double free supercat@casperkitty.com - 2016-07-14 07:13 -0700
                Re: double free Robert Wessel <robertwessel2@yahoo.com> - 2016-07-15 01:18 -0500
                Re: double free Jerry Stuckle <jstucklex@attglobal.net> - 2016-07-13 10:46 -0400
                Re: double free Robert Wessel <robertwessel2@yahoo.com> - 2016-07-15 00:59 -0500
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-14 23:47 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 11:22 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 11:35 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 14:33 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 15:16 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 16:19 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-15 08:39 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 16:54 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 21:20 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 16:45 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 17:15 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 17:42 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 21:18 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 21:06 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-15 21:46 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-15 23:08 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-16 01:26 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-15 18:22 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-15 18:48 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-15 18:40 -0700
                Re: double free supercat@casperkitty.com - 2016-07-15 10:09 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-15 11:07 -0700
                Re: double free supercat@casperkitty.com - 2016-07-15 12:11 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-15 12:30 -0700
                Re: double free supercat@casperkitty.com - 2016-07-15 12:41 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-15 13:04 -0700
                Re: double free supercat@casperkitty.com - 2016-07-15 14:26 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-19 10:00 -0700
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 12:46 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 13:19 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 13:30 +0100
                Re: double free Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-07-13 20:53 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-13 21:37 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-13 05:22 -0700
                Re: double free supercat@casperkitty.com - 2016-07-13 07:07 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-14 19:31 +0100
                Re: double free supercat@casperkitty.com - 2016-07-14 12:10 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-14 23:16 +0100
                Re: double free supercat@casperkitty.com - 2016-07-14 16:00 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-14 12:34 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-14 20:57 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-14 13:15 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-14 21:27 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-14 21:31 +0100
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-18 09:46 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 13:32 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 13:46 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-19 06:00 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-19 09:23 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-19 09:38 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 17:51 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 18:22 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 09:02 +0000
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-19 11:42 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-19 12:27 -0700
                Re: double free Philip Lantz <prl@canterey.us> - 2016-07-21 10:02 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-21 10:25 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-21 18:27 +0100
                Re: double free Cal Dershowitz <cal@example.invalid> - 2016-07-29 00:42 -0700
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 08:59 +0000
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 15:22 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 15:59 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 16:39 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 16:55 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 17:49 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 18:20 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 19:03 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-19 19:22 +0100
                sizeof (was Re: double free) Ken Brody <kenbrody@spamcop.net> - 2016-07-19 14:44 -0400
                Re: sizeof (was Re: double free) Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-19 12:31 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-19 22:46 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-19 15:19 -0700
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-20 00:21 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-23 19:21 +0000
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-19 12:08 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-19 09:41 -0700
                Re: double free Tim Rentsch <txr@alumni.caltech.edu> - 2016-07-21 18:10 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-22 11:23 +0100
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-22 03:40 -0700
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-22 10:33 -0700
                Re: double free Malcolm McLean <malcolm.mclean5@btinternet.com> - 2016-07-22 12:47 -0700
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-12 22:18 +0000
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 10:53 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 21:20 +0100
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 13:56 -0700
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 22:39 +0100
                Re: double free David Brown <david.brown@hesbynett.no> - 2016-07-12 10:57 +0200
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 21:58 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 13:23 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-11 13:00 +0000
                Re: double free Keith Thompson <kst-u@mib.org> - 2016-07-11 10:44 -0700
                Re: double free Gareth Owen <gwowen@gmail.com> - 2016-07-11 19:10 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 20:22 +0100
                Re: double free BartC <bc@freeuk.com> - 2016-07-11 21:11 +0100
                Re: double free Gareth Owen <gwowen@gmail.com> - 2016-07-11 21:49 +0100
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 22:01 +0100
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-11 09:09 -0400
                Re: double free Richard Heathfield <rjh@cpax.org.uk> - 2016-07-11 14:16 +0100
                Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-15 13:51 +0000
                Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-15 12:04 -0400
                Re: double free Jean-Marc Bourguet <jm@bourguet.org> - 2016-07-11 17:51 +0200
            Re: double free raltbos@xs4all.nl (Richard Bos) - 2016-07-11 10:19 +0000
  Re: double free Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2016-07-05 08:57 -0600
  Re: double free James Kuyper <jameskuyper@verizon.net> - 2016-07-05 11:13 -0400
    Re: double free supercat@casperkitty.com - 2016-07-05 09:05 -0700
      Re: double free G G <gdotone@gmail.com> - 2016-07-05 16:38 -0700
    Re: double free G G <gdotone@gmail.com> - 2016-07-05 16:34 -0700
  Re: double free Nobody <nobody@nowhere.invalid> - 2016-07-06 04:10 +0100
    Re: double free Siri Cruise <chine.bleu@yahoo.com> - 2016-07-05 21:27 -0700
      Re: double free supercat@casperkitty.com - 2016-07-06 02:53 -0700
        Re: double free Siri Cruise <chine.bleu@yahoo.com> - 2016-07-06 06:09 -0700
          Re: double free supercat@casperkitty.com - 2016-07-06 07:53 -0700
    Re: double free "Chris M. Thomasson" <invalid@invalid.invalid> - 2016-07-06 01:25 -0700
    Re: double free BartC <bc@freeuk.com> - 2016-07-06 11:12 +0100
  Re: double free Thiago Adams <thiago.adams@gmail.com> - 2016-11-27 09:52 -0800
    Re: double free supercat@casperkitty.com - 2016-11-27 10:05 -0800

csiph-web