[ 13/47] drm/i915: fix integer overflow in i915_gem_execbuffer2()

From: Greg KH
Date: Fri May 04 2012 - 16:48:33 EST


3.0-stable review patch. If anyone has any objections, please let me know.

------------------

From: Xi Wang <xi.wang@xxxxxxxxx>

commit ed8cd3b2cd61004cab85380c52b1817aca1ca49b upstream.

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@xxxxxxxxx>
Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1296,7 +1296,8 @@ i915_gem_execbuffer2(struct drm_device *
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_ERROR("execbuf2 with %d buffers\n", args->buffer_count);
return -EINVAL;
}


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