drm: Check if the allocation has succeeded before dereferencing newmode

We allocate memory in drm_display_mode_from_vic_index() and use it
without checking the pointer is valid. Fix that.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index f8d8a1de9573..f3cde90c1d98 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -2580,6 +2580,9 @@ drm_display_mode_from_vic_index(struct drm_connector *connector,
                 return NULL;
 
         newmode = drm_mode_duplicate(dev, &edid_cea_modes[cea_mode]);
+        if (!newmode)
+                return NULL;
+
         newmode->vrefresh = 0;
 
         return newmode;