From: Eric Dumazet <edumazet@google.com>
Date: Sat, 16 Mar 2019 13:09:53 -0700
Subject: tun: add a missing rcu_read_unlock() in error path
Git-commit: 9180bb4f046064dfa4541488102703b402bb04e1
Patch-mainline: v5.1-rc3
References: networking-stable-19_03_28

In my latest patch I missed one rcu_read_unlock(), in case
device is down.

Fixes: 4477138fa0ae ("tun: properly test for IFF_UP")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
 drivers/net/tun.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1353,6 +1353,7 @@ drop:
 	rcu_read_lock();
 	if (unlikely(!(tun->dev->flags & IFF_UP))) {
 		err = -EIO;
+		rcu_read_unlock();
 		goto drop;
 	}