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Groups > linux.kernel > #1402774
| From | Andrey Ryabinin <ryabinin.a.a@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: UBSAN whinge in ihci-hub.c |
| Date | 2016-05-18 09:50 +0200 |
| Message-ID | <rA4oW-7vr-31@gated-at.bofh.it> (permalink) |
| References | <rzVbX-1Ac-5@gated-at.bofh.it> <rzVvk-1Vr-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
2016-05-18 1:16 GMT+03:00 Greg Kroah-Hartman <gregkh@linuxfoundation.org>: > On Tue, May 17, 2016 at 05:52:40PM -0400, Valdis Kletnieks wrote: >> So, not content in the amount of breakage I generate already, I >> compiled with UBSAN enabled... >> >> The immediately relevant part: >> >> [ 2.418576] ================================================================================ >> [ 2.418579] UBSAN: Undefined behaviour in drivers/usb/host/ehci-hub.c:877:47 >> [ 2.418582] index -1 is out of range for type 'u32 [1]' > > <snip> > > It's a known bug in ubsan, It's not a bug. int *p = &a[-1] is undefined behavior. It doesn't matter whether that pointer dereferenced or not.
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UBSAN whinge in ihci-hub.c Valdis Kletnieks <Valdis.Kletnieks@vt.edu> - 2016-05-18 00:00 +0200
Re: UBSAN whinge in ihci-hub.c Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2016-05-18 00:20 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-18 09:50 +0200
Re: UBSAN whinge in ihci-hub.c Oliver Neukum <oneukum@suse.com> - 2016-05-18 10:30 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-18 11:20 +0200
Re: UBSAN whinge in ihci-hub.c Oliver Neukum <oneukum@suse.com> - 2016-05-18 12:30 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-18 14:30 +0200
Re: UBSAN whinge in ihci-hub.c Alan Stern <stern@rowland.harvard.edu> - 2016-05-18 16:50 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-18 17:10 +0200
Re: UBSAN whinge in ihci-hub.c Alan Stern <stern@rowland.harvard.edu> - 2016-05-18 18:10 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-18 19:20 +0200
Re: UBSAN whinge in ihci-hub.c Alan Stern <stern@rowland.harvard.edu> - 2016-05-18 21:30 +0200
Re: UBSAN whinge in ihci-hub.c Andrey Ryabinin <ryabinin.a.a@gmail.com> - 2016-05-19 18:30 +0200
Re: UBSAN whinge in ihci-hub.c Alan Stern <stern@rowland.harvard.edu> - 2016-05-19 22:20 +0200
RE: UBSAN whinge in ihci-hub.c David Laight <David.Laight@ACULAB.COM> - 2016-05-23 18:10 +0200
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