drm/i915: fix integer overflow in i915_gem_execbuffer2()
authorXi Wang <xi.wang@gmail.com>
Mon, 23 Apr 2012 08:06:41 +0000 (04:06 -0400)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Mon, 23 Apr 2012 20:32:02 +0000 (22:32 +0200)
commited8cd3b2cd61004cab85380c52b1817aca1ca49b
treead2f39b75035d8120760ab0397e0256d1bb2f245
parente95c8438ea1c56c254f0607c8fb6bca7f463c744
drm/i915: fix integer overflow in i915_gem_execbuffer2()

On 32-bit systems, a large args->buffer_count from userspace via ioctl
may overflow the allocation size, leading to out-of-bounds access.

This vulnerability was introduced in commit 8408c282 ("drm/i915:
First try a normal large kmalloc for the temporary exec buffers").

Signed-off-by: Xi Wang <xi.wang@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
drivers/gpu/drm/i915/i915_gem_execbuffer.c