diff options
author | Xi Wang <xi.wang@gmail.com> | 2012-04-23 08:06:41 (GMT) |
---|---|---|
committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-04-23 20:32:02 (GMT) |
commit | ed8cd3b2cd61004cab85380c52b1817aca1ca49b (patch) | |
tree | ad2f39b75035d8120760ab0397e0256d1bb2f245 /drivers/gpu | |
parent | e95c8438ea1c56c254f0607c8fb6bca7f463c744 (diff) | |
download | linux-ed8cd3b2cd61004cab85380c52b1817aca1ca49b.tar.xz |
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>
Diffstat (limited to 'drivers/gpu')
-rw-r--r-- | drivers/gpu/drm/i915/i915_gem_execbuffer.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index f51a696..7c50e58 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -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; } |