[PATCH] drm/bridge: imx: fix potential NULL pointer dereference in imx8qxp_ldb_parse_dt_companion()

[Zhang Shurong]

of_match_device() may fail and returns a NULL pointer.

Fix this by checking the return value of of_match_device().

Fixes: 3818715f62b4 ("drm/bridge: imx: Add LDB support for i.MX8qxp")
Signed-off-by: Zhang Shurong <zhang_shur...@foxmail.com>
---
 drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c 
b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
index 7984da9c0a35..d272f35c8eac 100644
--- a/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
+++ b/drivers/gpu/drm/bridge/imx/imx8qxp-ldb.c
@@ -488,6 +488,8 @@ static int imx8qxp_ldb_parse_dt_companion(struct 
imx8qxp_ldb *imx8qxp_ldb)
         * string.
         */
        match = of_match_device(dev->driver->of_match_table, dev);
+       if (!match)
+               return -ENODEV;
        if (!of_device_is_compatible(companion, match->compatible)) {
                DRM_DEV_ERROR(dev, "companion LDB is incompatible\n");
                ret = -ENXIO;
-- 
2.30.2