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Subject[PATCH 4.19 032/134] tun: add a missing rcu_read_unlock() in error path
Date
4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Eric Dumazet <edumazet@google.com>

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>

---
drivers/net/tun.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1915,6 +1915,7 @@ drop:
rcu_read_lock();
if (unlikely(!(tun->dev->flags & IFF_UP))) {
err = -EIO;
+ rcu_read_unlock();
goto drop;
}


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