[PATCH 4/4] drm/exynos: fix NULL pointer reference

[Joonyoung Shim]

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 at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_encoder.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_encoder.c 
b/drivers/gpu/drm/exynos/exynos_drm_encoder.c
index 7e282e3..57de0bd 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);
        }
 }
-- 
1.9.1