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.
https://bugzilla.redhat.com/show_bug.cgi?id=824176
http://www.securityfocus.com/bid/53971
http://www.openwall.com/lists/oss-security/2012/05/22/8
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.3.5
http://rhn.redhat.com/errata/RHSA-2012-1156.html