diff options
| author | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2017-08-10 17:50:43 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2017-08-10 23:59:26 +0300 |
| commit | 06bfe5b0d892f8120172380694eb66eeb23baf90 (patch) | |
| tree | be99d43eaf087afa2d12fd901aecf5faa0944aa4 /drivers/gpu/drm/i915/intel_dp_mst.c | |
| parent | 28b6cb08206fe19585f57c3f5c683aff9b2e2fdf (diff) | |
| download | linux-06bfe5b0d892f8120172380694eb66eeb23baf90.tar.xz | |
drm/i915: Avoid null dereference if mst_port is unset.
I'm not sure if this is really the case and I don't believe
this is the real fix for the bug mentioned here, but since
I don't see a reliable path when mst_port is set and when
mode_valid is requested I believe it is worth to have this
protection here.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102022
Cc: Elizabeth <elizabethx.de.la.torre.mena@intel.com>
Cc: Stefan Assmann <sassmann@redhat.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20170810145043.24047-1-rodrigo.vivi@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp_mst.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp_mst.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c index 58568559711a..93fc8ab9bb31 100644 --- a/drivers/gpu/drm/i915/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/intel_dp_mst.c @@ -370,6 +370,9 @@ intel_dp_mst_mode_valid(struct drm_connector *connector, int bpp = 24; /* MST uses fixed bpp */ int max_rate, mode_rate, max_lanes, max_link_clock; + if (!intel_dp) + return MODE_ERROR; + max_link_clock = intel_dp_max_link_rate(intel_dp); max_lanes = intel_dp_max_lane_count(intel_dp); |