drm/exynos: Fix potential NULL pointer dereference

drm_mode_create() returns NULL if it fails to create
a new display mode. Check the value returned to avoid NULL
pointer deferencing later.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_connector.c b/drivers/gpu/drm/exynos/exynos_drm_connector.c
index 59e79ff4b2eb..87cf3783efdc 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_connector.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_connector.c
@@ -150,8 +150,12 @@ static int exynos_drm_connector_get_modes(struct drm_connector *connector)
                 count = drm_add_edid_modes(connector, edid);
                 kfree(edid);
         } else {
-                struct drm_display_mode *mode = drm_mode_create(connector->dev);
                 struct exynos_drm_panel_info *panel;
+                struct drm_display_mode *mode = drm_mode_create(connector->dev);
+                if (!mode) {
+                        DRM_ERROR("failed to create a new display mode.\n");
+                        return 0;
+                }
 
                 if (display_ops->get_panel)
                         panel = display_ops->get_panel(manager->dev);