[PATCH] media: renesas: rzg2l-cru: Fix possible ERR_PTR dereference in rzg2l_cru_get_virtual_channel()

[Alper Ak]

media_pad_remote_pad_unique() can return ERR_PTR(-ENOTUNIQ) or
ERR_PTR(-ENOLINK) on error situation.

The current code dereferences remote_pad without checking for
these error cases, which could lead to invalid memory access.

Add IS_ERR() check before dereferencing the pointer.

Fixes: d7d72dae81d5 ("media: rzg2l-cru: Retrieve virtual channel information")
Signed-off-by: Alper Ak <alperyasinak1@xxxxxxxxx>
---
 drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c | 3 +++
 1 file changed, 3 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..bf7d96841c78 100644
--- a/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
+++ b/drivers/media/platform/renesas/rzg2l-cru/rzg2l-video.c
@@ -411,6 +411,9 @@ 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))
+		return PTR_ERR(remote_pad);
+
 	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