[PATCH 2/4] Input: sur40 - fix V4L error path cleanup

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

In sur40_probe(), if video_register_device() fails, the error path jumps to
err_unreg_video. This incorrectly attempts to unregister a video device
that was never successfully registered, and fails to free the V4L2 control
handler (v4l2_ctrl_handler_free) that was initialized immediately prior.

Fix this by introducing an err_free_ctrl label to properly free the V4L2
control handler and bypass video_unregister_device() when video device
registration fails.

Reported-by: sashiko-bot@kernel.org
Cc: stable@vger.kernel.org
Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/touchscreen/sur40.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/sur40.c b/drivers/input/touchscreen/sur40.c
index 8639ec3ad703..e9089b0c3e2f 100644
--- a/drivers/input/touchscreen/sur40.c
+++ b/drivers/input/touchscreen/sur40.c
@@ -787,7 +787,7 @@ static int sur40_probe(struct usb_interface *interface,
 	if (error) {
 		dev_err(&interface->dev,
 			"Unable to register video subdevice.");
-		goto err_unreg_video;
+		goto err_free_ctrl;
 	}
 
 	/* register the polled input device */
@@ -806,6 +806,8 @@ static int sur40_probe(struct usb_interface *interface,
 
 err_unreg_video:
 	video_unregister_device(&sur40->vdev);
+err_free_ctrl:
+	v4l2_ctrl_handler_free(&sur40->hdl);
 err_unreg_v4l2:
 	v4l2_device_unregister(&sur40->v4l2);
 err_free_buffer:
-- 
2.54.0.1136.gdb2ca164c4-goog