[PATCH 4.4 15/65] media-devnode: add missing mutex lock in error handler

[Greg Kroah-Hartman]

From: Max Kellermann <max@xxxxxxxxxxx>

commit 88336e174645948da269e1812f138f727cd2896b upstream.

We should protect the device unregister patch too, at the error
condition.

Signed-off-by: Max Kellermann <max@xxxxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/media/media-devnode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/media-devnode.c b/drivers/media/media-devnode.c
index 6c56aebd8db0..86c7c3732c84 100644
--- a/drivers/media/media-devnode.c
+++ b/drivers/media/media-devnode.c
@@ -282,8 +282,11 @@ int __must_check media_devnode_register(struct media_devnode *mdev,
 	return 0;
 
 error:
+	mutex_lock(&media_devnode_lock);
 	cdev_del(&mdev->cdev);
 	clear_bit(mdev->minor, media_devnode_nums);
+	mutex_unlock(&media_devnode_lock);
+
 	return ret;
 }
 
-- 
2.25.1