4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Eric Dumazet <edumazet@xxxxxxxxxx>
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@xxxxxxxxxx>
Reported-by: syzbot <syzkaller@xxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/tun.c | 1 +
1 file changed, 1 insertion(+)
--- 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;
}
