[PATCH] media: v4l2-ctrls-request: add NULL check in, v4l2_ctrl_request_complete()

[Sergey Shtylyov <s.shtylyov@auroraos.dev>]

If CONFIG_MEDIA_CONTROLLER is undefined, media_request_object_find() will
always return NULL, so its 2nd call in v4l2_ctrl_request_complete() would
fail as well as the 1st one and thus cause hdl to have a wrong value (at
the top of memory) and list_for_each_entry() to iterate over the garbage
data located there. Add NULL check for the 2nd call and place the error
cleanup at the end of v4l2_ctrl_request_complete()...

Found by Linux Verification Center (linuxtesting.org) with the Svace static
analysis tool.

Fixes: c3bf5129f339 ("media: v4l2-ctrls: always copy the controls on completion")
Signed-off-by: Sergey Shtylyov <s.shtylyov@auroraos.dev>

---
The patch is against the fixes branch of the git.linuxtv.org/media.git repo...

 drivers/media/v4l2-core/v4l2-ctrls-request.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-ctrls-request.c b/drivers/media/v4l2-core/v4l2-ctrls-request.c
index 4b7e6981b8d6..5c2fc767c6a6 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-request.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-request.c
@@ -348,13 +348,12 @@ void v4l2_ctrl_request_complete(struct media_request *req,
 		ret = v4l2_ctrl_handler_init(hdl, (main_hdl->nr_of_buckets - 1) * 8);
 		if (!ret)
 			ret = v4l2_ctrl_request_bind(req, hdl, main_hdl);
-		if (ret) {
-			v4l2_ctrl_handler_free(hdl);
-			kfree(hdl);
-			return;
-		}
+		if (ret)
+			goto error;
 		hdl->request_is_queued = true;
 		obj = media_request_object_find(req, &req_ops, main_hdl);
+		if (!obj)
+			goto error;
 	}
 	hdl = container_of(obj, struct v4l2_ctrl_handler, req_obj);
 
@@ -389,6 +388,11 @@ void v4l2_ctrl_request_complete(struct media_request *req,
 	mutex_unlock(main_hdl->lock);
 	media_request_object_complete(obj);
 	media_request_object_put(obj);
+	return;
+
+error:
+	v4l2_ctrl_handler_free(hdl);
+	kfree(hdl);
 }
 EXPORT_SYMBOL(v4l2_ctrl_request_complete);
 
-- 
2.53.0