[PATCH 2/3] drm/bridge: imx8qxp-pxl2dpi: Fix NULL pointer dereference in imx8qxp_pxl2dpi_bridge_destroy()

[Liu Ying]

Pointer bridge->driver_private in imx8qxp_pxl2dpi_bridge_destroy()
is NULL when imx8qxp_pxl2dpi_bridge_probe() returns error, because
the pointer is initialized only when imx8qxp_pxl2dpi_bridge_probe()
returns 0.  The NULL pointer would be set to pointer p2d and then
NULL pointer p2d would be dereferenced.  Fix this by returning early
from imx8qxp_pxl2dpi_bridge_destroy() if !p2d is true.

Fixes: 900699ba830f ("drm/bridge: imx8qxp-pxl2dpi: get/put the companion bridge")
Signed-off-by: Liu Ying <victor.liu at nxp.com>
---
 drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
index f0814702b641..9dc2b3d2ecef 100644
--- a/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
+++ b/drivers/gpu/drm/bridge/imx/imx8qxp-pxl2dpi.c
@@ -67,6 +67,9 @@ static void imx8qxp_pxl2dpi_bridge_destroy(struct drm_bridge *bridge)
 {
 	struct imx8qxp_pxl2dpi *p2d = bridge->driver_private;
 
+	if (!p2d)
+		return;
+
 	drm_bridge_put(p2d->companion);
 }
 

-- 
2.43.0