armbian/linux
0
0
Fork 0
mirror of https://github.com/armbian/linux.git synced 2026-01-06 10:13:00 -08:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915: fix integer overflow in i915_gem_execbuffer2()

Browse Source 
commit ed8cd3b2cd 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@gmail.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xi Wang
2012-04-23 04:06:41 -04:00
committed by Greg Kroah-Hartman
parent 8c9def922a
commit fb247af4cc
1 changed files with 2 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/i915_gem_execbuffer.c
View File

@@ -1296,7 +1296,8 @@ 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_ERROR("execbuf2 with %d buffers\n", args->buffer_count);
return -EINVAL;
}