Integer overflow in the i915_gem_execbuffer2 function in drivers/gpu/drm/i915/i915_gem_execbuffer.c in the Direct Rendering Manager (DRM) subsystem in the Linux kernel before 3.3.5 on 32-bit platforms allows local users to cause a denial of service (out-of-bounds write) or possibly have unspecified other impact via a crafted ioctl call.
http://marc.info/?l=bugtraq&m=139447903326211&w=2
http://rhn.redhat.com/errata/RHSA-2012-1156.html
https://bugzilla.redhat.com/show_bug.cgi?id=824176
https://github.com/torvalds/linux/commit/ed8cd3b2cd61004cab85380c52b1817aca1ca49b