drm/mst: Avoid dereferencing a NULL mstb in drm_dp_mst_handle_up_req()
authorImre Deak <imre.deak@intel.com>
Wed, 19 Jul 2017 11:43:29 +0000 (14:43 +0300)
committerDaniel Vetter <daniel.vetter@ffwll.ch>
Thu, 20 Jul 2017 08:20:30 +0000 (10:20 +0200)
commit7f8b3987da54cb4d41ad2545cd4d7958b9a36bdf
tree5d6237aee6684dd6becba708d10207eef81dd970
parent448421b5e93b9177c5698f0cf6f5e72d2995eeca
drm/mst: Avoid dereferencing a NULL mstb in drm_dp_mst_handle_up_req()

In case of an unknown broadcast message is sent mstb will remain unset,
so check for this.

Cc: Dave Airlie <airlied@redhat.com>
Cc: Lyude <lyude@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Lyude <lyude@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20170719114330.26540-3-imre.deak@intel.com
drivers/gpu/drm/drm_dp_mst_topology.c