tun: add a missing rcu_read_unlock() in error path

commit 9180bb4f046064dfa4541488102703b402bb04e1 upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index c32df13a863082cbc144ba8faff71a7906eaa5c5..88fe38d6a7efaa1e9701c439c3ff30bfc7ff1188 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1330,6 +1330,7 @@ drop:
        rcu_read_lock();
        if (unlikely(!(tun->dev->flags & IFF_UP))) {
                err = -EIO;
+               rcu_read_unlock();
                goto drop;
        }