Forwarded: [PATCH] media: msi2500: fix memory leak in msi2500_probe error path

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Subject: [PATCH] media: msi2500: fix memory leak in msi2500_probe error path
Author: daiky0325@xxxxxxxxx

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

When video_register_device() fails in msi2500_probe(), the error path
jumps to err_unregister_v4l2_dev, which skips the call to
v4l2_ctrl_handler_free(). This leaks memory allocated by
v4l2_ctrl_handler_init() and v4l2_ctrl_add_handler().

Fix this by jumping to err_free_controls instead, which properly frees
the control handler before unregistering the v4l2 device.

Reported-by: syzbot+b1de0d5fd8a15fac11aa@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://syzkaller.appspot.com/bug?extid=b1de0d5fd8a15fac11aa
Signed-off-by: Daiki Harada <daiky0325@xxxxxxxxx>
---
 drivers/media/usb/msi2500/msi2500.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/msi2500/msi2500.c b/drivers/media/usb/msi2500/msi2500.c
index 1ff98956b680..76e1f2bfab0c 100644
--- a/drivers/media/usb/msi2500/msi2500.c
+++ b/drivers/media/usb/msi2500/msi2500.c
@@ -1265,7 +1265,7 @@ static int msi2500_probe(struct usb_interface *intf,
 	if (ret) {
 		dev_err(dev->dev,
 			"Failed to register as video device (%d)\n", ret);
-		goto err_unregister_v4l2_dev;
+		goto err_free_controls;
 	}
 	dev_info(dev->dev, "Registered as %s\n",
 		 video_device_node_name(&dev->vdev));
-- 
2.54.0