[Bug 98372] UBSAN in ../drivers/gpu/drm/drm_modes.c:325:49

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98372

            Bug ID: 98372
           Summary: UBSAN in ../drivers/gpu/drm/drm_modes.c:325:49
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/other
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: marxin.liska at gmail.com

Running $uname -a
Linux linux-h8g6 4.9.0-rc1-2-syzkaller #1 SMP PREEMPT Mon Oct 17 19:37:55 UTC
2016 (55c3dd5) x86_64 x86_64 x86_64 GNU/Linux

with enabled UBSAN (built by GCC 7.0) in qemu, I reached following error:

[   48.723720] UBSAN: Undefined behaviour in
../drivers/gpu/drm/drm_modes.c:325:49
[   48.726943] signed integer overflow:
[   48.728503] 2240 * 1000000 cannot be represented in type 'int'

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