kernel: drm/i915: integer overflow in i915_gem_do_execbuffer()

Integer overflow in the i915gemdoexecbuffer function in drivers/gpu/drm/i915/i915gemexecbuffer.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 othe...