drm/crtc_helper: avoid NULL-pointer dereference when encoder is NULL

Signed-off-by: Maarten Maathuis <madman2003@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index db0237d..e7e6c25 100644 (file)
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -842,7 +842,8 @@ int drm_crtc_helper_set_config(struct drm_mode_set *set)
                        /* If the encoder is reused for another connector, then
                         * the appropriate crtc will be set later.
                         */
-                       connector->encoder->crtc = NULL;
+                       if (connector->encoder)
+                               connector->encoder->crtc = NULL;
                        connector->encoder = new_encoder;
                }
        }