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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index db0237dec6c4..e7e6c25b560c 100644
--- 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;
                 }
         }