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

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

diff --git a/drivers/gpu/drm/imx/imx-ldb.c b/drivers/gpu/drm/imx/imx-ldb.c
index e5078d03020d90e84b2ca6acbc877ae52234d4ac..fb0e951248f685ed0ace2f601c1fba6478db342f 100644 (file)
--- a/drivers/gpu/drm/imx/imx-ldb.c
+++ b/drivers/gpu/drm/imx/imx-ldb.c
@@ -572,6 +572,8 @@ 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,