drm/bridge: make drm_panel_bridge_remove more robust

Make sure that bridge parameter is not NULL and can be safely
cast into a panel_bridge structure.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Reviewed-by: Philippe Cornu <philippe.cornu@st.com>
Tested-by: Philippe Cornu <philippe.cornu@st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1506936755-23625-2-git-send-email-benjamin.gaignard@linaro.org

diff --git a/drivers/gpu/drm/bridge/panel.c b/drivers/gpu/drm/bridge/panel.c
index e0cca19..6d99d4a 100644 (file)
--- a/drivers/gpu/drm/bridge/panel.c
+++ b/drivers/gpu/drm/bridge/panel.c
@@ -188,7 +188,15 @@ EXPORT_SYMBOL(drm_panel_bridge_add);
  */
 void drm_panel_bridge_remove(struct drm_bridge *bridge)
 {
-       struct panel_bridge *panel_bridge = drm_bridge_to_panel_bridge(bridge);
+       struct panel_bridge *panel_bridge;
+
+       if (!bridge)
+               return;
+
+       if (bridge->funcs != &panel_bridge_bridge_funcs)
+               return;
+
+       panel_bridge = drm_bridge_to_panel_bridge(bridge);
 
        drm_bridge_remove(bridge);
        devm_kfree(panel_bridge->panel->dev, bridge);