tree 80d834baf72aa0f9b205c24528403a5eb69a3581
parent a497c3ba1d97fc69c1e78e7b96435ba8c2cb42ee
author Zhaowei Yuan <zhaowei.yuan@samsung.com> 1403073239 +0800
committer Dave Airlie <airlied@redhat.com> 1403666817 +1000

drm: fix NULL pointer access by wrong ioctl

If user uses wrong ioctl command with _IOC_NONE and argument size
greater than 0, it can cause NULL pointer access from memset of line
463. If _IOC_NONE, don't memset to 0 for kdata.

Signed-off-by: Zhaowei Yuan <zhaowei.yuan@samsung.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>