drm/imx: imx-ldb: Check for null pointer after calling kmemdup

[ Upstream commit 8027a9ad9b3568c5eb49c968ad6c97f279d76730 ]

As the possible failure of the allocation, kmemdup() may return NULL
pointer.
Therefore, it should be better to check the return value of kmemdup()
and return error if fails.

Fixes: dc80d7038883 ("drm/imx-ldb: Add support to drm-bridge")
Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220105074729.2363657-1-jiasheng@iscas.ac.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index 75036aaa0c63959dd06cc94106635c2ba18c4005..efd13e533726be8d1b9005f725f6d99027062fe5 100644 (file)
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -553,6 +553,8 @@ static int imx_ldb_panel_ddc(struct device *dev,
                edidp = of_get_property(child, "edid", &edid_len);
                if (edidp) {
                        channel->edid = kmemdup(edidp, edid_len, GFP_KERNEL);
+                       if (!channel->edid)
+                               return -ENOMEM;
                } else if (!channel->panel) {
                        /* fallback to display-timings node */
                        ret = of_get_drm_display_mode(child,