[PATCH v3] drm/i915: bounds check execbuffer relocation count

[Chris Wilson]

On Mon, Mar 11, 2013 at 05:31:45PM -0700, Kees Cook wrote:
> It is possible to wrap the counter used to allocate the buffer for
> relocation copies. This could lead to heap writing overflows.
> 
> CVE-2013-0913
> 
> v3: collapse test, improve comment
> v2: move check into validate_exec_list
> 
> Signed-off-by: Kees Cook <keescook at chromium.org>
> Reported-by: Pinkie Pie
> Cc: stable at vger.kernel.org

Looks good to me. The only bikeshed that remains is whether we should
just collapse the two variables into one, but the current 'max - count'
is more idiomatic and so preferrable.
Reviewed-by: Chris Wilson <chris at chris-wilson.co.uk>
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre