Integer overflow in the i915_gem_do_execbuffer 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://github.com/torvalds/linux/commit/44afb3a04391a74309d16180d1e4f8386fdfa745
https://bugzilla.redhat.com/show_bug.cgi?id=824178
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