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drm/i915: fix integer overflow in i915_gem_execbuffer2()

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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>
This commit is contained in:
Xi Wang 2012-04-23 04:06:41 -04:00 committed by Daniel Vetter
parent e95c8438ea
commit ed8cd3b2cd
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
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@ -1404,7 +1404,8 @@ i915_gem_execbuffer2(struct drm_device *dev, void *data,
struct drm_i915_gem_exec_object2 *exec2_list = NULL;
int ret;
if (args->buffer_count < 1) {
if (args->buffer_count < 1 ||
args->buffer_count > UINT_MAX / sizeof(*exec2_list)) {
DRM_DEBUG("execbuf2 with %d buffers\n", args->buffer_count);
return -EINVAL;
}