drm/exynos: fix NULL pointer reference

There is a case called disable_plane callback function even if
plane->crtc is NULL from exynos_drm_encoder_disable and it will cause
NULL pointer reference error.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_encoder.c b/drivers/gpu/drm/exynos/exynos_drm_encoder.c
index 7e282e3d6038..57de0bdc5a3b 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_encoder.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_encoder.c
@@ -102,7 +102,7 @@ static void exynos_drm_encoder_disable(struct drm_encoder *encoder)
 
         /* all planes connected to this encoder should be also disabled. */
         drm_for_each_legacy_plane(plane, &dev->mode_config.plane_list) {
-                if (plane->crtc == encoder->crtc)
+                if (plane->crtc && (plane->crtc == encoder->crtc))
                         plane->funcs->disable_plane(plane);
         }
 }