kfree a pointer "from the middle" causing protection faults

From	Muni Sekhar <munisekharrms@gmail.com>
Newsgroups	linux.kernel
Subject	kfree a pointer "from the middle" causing protection faults
Date	2015-09-02 17:10 +0200
Message-ID	<q4hPI-bE-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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Hello,


I am getting protection faults in different kernel modules if I try to
free a pointer "from the middle" for example, look at the following
code:


u8 *buf;


buf = kzalloc( 100 , GFP_KERNEL );

…

buf = buf + 50;

…

Kfree(buf);




I would like to know, why the above code is causing protection faults
in other kernel modules?


Regards,
Sekhar
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Thread

kfree a pointer "from the middle" causing protection faults Muni Sekhar <munisekharrms@gmail.com> - 2015-09-02 17:10 +0200
  Re: kfree a pointer "from the middle" causing protection faults Jeff Epler <jepler@unpythonic.net> - 2015-09-02 18:20 +0200
    Re: kfree a pointer "from the middle" causing protection faults Muni Sekhar <munisekharrms@gmail.com> - 2015-09-03 06:30 +0200
  Re: kfree a pointer "from the middle" causing protection faults Dmitry Torokhov <dmitry.torokhov@gmail.com> - 2015-09-02 18:40 +0200

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