releases/5.0.6/tun-add-a-missing-rcu_read_unlock-in-error-path.patch

   1 From 9180bb4f046064dfa4541488102703b402bb04e1 Mon Sep 17 00:00:00 2001
   2 From: Eric Dumazet <edumazet@google.com>
   3 Date: Sat, 16 Mar 2019 13:09:53 -0700
   4 Subject: tun: add a missing rcu_read_unlock() in error path
   5
   6 From: Eric Dumazet <edumazet@google.com>
   7
   8 commit 9180bb4f046064dfa4541488102703b402bb04e1 upstream.
   9
  10 In my latest patch I missed one rcu_read_unlock(), in case
  11 device is down.
  12
  13 Fixes: 4477138fa0ae ("tun: properly test for IFF_UP")
  14 Signed-off-by: Eric Dumazet <edumazet@google.com>
  15 Reported-by: syzbot <syzkaller@googlegroups.com>
  16 Signed-off-by: David S. Miller <davem@davemloft.net>
  17 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  18
  19 ---
  20  drivers/net/tun.c |    1 +
  21  1 file changed, 1 insertion(+)
  22
  23 --- a/drivers/net/tun.c
  24 +++ b/drivers/net/tun.c
  25 @@ -1960,6 +1960,7 @@ drop:
  26         rcu_read_lock();
  27         if (unlikely(!(tun->dev->flags & IFF_UP))) {
  28                 err = -EIO;
  29 +               rcu_read_unlock();
  30                 goto drop;
  31         }
  32