[PATCH] media: rzg2l-cru: Fix possible ERR_PTR deference

[Alper Ak <alperyasinak1@gmail.com>]

The media_pad_remote_pad_unique() can return ERR_PTR() on failure
(-ENOTUNIQ or -ENOLINK), but the code was dereferencing the return
value without checking for errors. Add IS_ERR() check before
dereferencing the pointer.

Fixes: d7d72dae81d5 ("media: rzg2l-cru: Retrieve virtual channel information")
Signed-off-by: Alper Ak <alperyasinak1@gmail.com>
---
 drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
index 162e2ace6931..a34c2188df1a 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
@@ -411,6 +411,12 @@ static int rzg2l_cru_get_virtual_channel(struct rzg2l_cru_dev *cru)
 	int ret;
 
 	remote_pad = media_pad_remote_pad_unique(&cru->ip.pads[RZG2L_CRU_IP_SINK]);
+	if (IS_ERR(remote_pad)) {
+		ret = PTR_ERR(remote_pad);
+		dev_err(cru->dev, "Failed to get remote source pad: %d\n", ret);
+		return ret;
+	}
+
 	ret = v4l2_subdev_call(cru->ip.remote, pad, get_frame_desc, remote_pad->index, &fd);
 	if (ret < 0 && ret != -ENOIOCTLCMD) {
 		dev_err(cru->dev, "get_frame_desc failed on IP remote subdev\n");
-- 
2.43.0