drm: integer overflow in drm_mode_dirtyfb_ioctl()
authorXi Wang <xi.wang@gmail.com>
Wed, 23 Nov 2011 06:12:01 +0000 (01:12 -0500)
committerDave Airlie <airlied@redhat.com>
Wed, 23 Nov 2011 08:59:28 +0000 (08:59 +0000)
commita5cd335165e31db9dbab636fd29895d41da55dd2
tree4d01d5801047b466c44c40231773e66a9dfb704d
parentc916874d60d9daf2e2d5f4f622b185ef57deb6a4
drm: integer overflow in drm_mode_dirtyfb_ioctl()

There is a potential integer overflow in drm_mode_dirtyfb_ioctl()
if userspace passes in a large num_clips.  The call to kmalloc would
allocate a small buffer, and the call to fb->funcs->dirty may result
in a memory corruption.

Reported-by: Haogang Chen <haogangchen@gmail.com>
Signed-off-by: Xi Wang <xi.wang@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
drivers/gpu/drm/drm_crtc.c
include/drm/drm_mode.h