linux-kernel - [PATCH] drm/bridge: imx: fix potential NULL pointer dereference in imx8qxp_ldb_parse_dt

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Date:   Tue, 29 Aug 2023 00:55:01 +0800
From:   Zhang Shurong <zhang_shurong@...mail.com>
To:     victor.liu@....com
Cc:     andrzej.hajda@...el.com, neil.armstrong@...aro.org,
        rfoss@...nel.org, Laurent.pinchart@...asonboard.com,
        jonas@...boo.se, jernej.skrabec@...il.com, airlied@...il.com,
        daniel@...ll.ch, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Zhang Shurong <zhang_shurong@...mail.com>
Subject: [PATCH] drm/bridge: imx: fix potential NULL pointer dereference in imx8qxp_ldb_parse_dt_companion()

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_shurong@...mail.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