releases/4.4.154/net-caif-add-a-missing-rcu_read_unlock-in-caif_flow_cb.patch

   1 From foo@baz Tue Aug 28 16:10:37 CEST 2018
   2 From: YueHaibing <yuehaibing@huawei.com>
   3 Date: Thu, 19 Jul 2018 10:27:13 +0800
   4 Subject: net: caif: Add a missing rcu_read_unlock() in caif_flow_cb
   5
   6 From: YueHaibing <yuehaibing@huawei.com>
   7
   8 [ Upstream commit 64119e05f7b31e83e2555f6782e6cdc8f81c63f4 ]
   9
  10 Add a missing rcu_read_unlock in the error path
  11
  12 Fixes: c95567c80352 ("caif: added check for potential null return")
  13 Signed-off-by: YueHaibing <yuehaibing@huawei.com>
  14 Signed-off-by: David S. Miller <davem@davemloft.net>
  15 Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
  16 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  17 ---
  18  net/caif/caif_dev.c |    4 +++-
  19  1 file changed, 3 insertions(+), 1 deletion(-)
  20
  21 --- a/net/caif/caif_dev.c
  22 +++ b/net/caif/caif_dev.c
  23 @@ -131,8 +131,10 @@ static void caif_flow_cb(struct sk_buff
  24         caifd = caif_get(skb->dev);
  25
  26         WARN_ON(caifd == NULL);
  27 -       if (caifd == NULL)
  28 +       if (!caifd) {
  29 +               rcu_read_unlock();
  30                 return;
  31 +       }
  32
  33         caifd_hold(caifd);
  34         rcu_read_unlock();