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 e5078d0..fb0e951 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,