4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: David Ahern <dsah...@gmail.com>


[ Upstream commit 82dd0d2a9a76fc8fa2b18d80b987d455728bf83a ]

Miguel reported an skb use after free / double free in vrf_finish_output
when neigh_output returns an error. The vrf driver should return after
the call to neigh_output as it takes over the skb on error path as well.

Patch is a simplified version of Miguel's patch which was written for 4.9,
and updated to top of tree.

Fixes: 8f58336d3f78a ("net: Add ethernet header for pass through VRF device")
Signed-off-by: Miguel Fadon Perlines <mfa...@teldat.com>
Signed-off-by: David Ahern <dsah...@gmail.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/net/vrf.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -579,12 +579,13 @@ static int vrf_finish_output(struct net
        if (!IS_ERR(neigh)) {
                sock_confirm_neigh(skb, neigh);
                ret = neigh_output(neigh, skb);
+               rcu_read_unlock_bh();
+               return ret;
        }
 
        rcu_read_unlock_bh();
 err:
-       if (unlikely(ret < 0))
-               vrf_tx_error(skb->dev, skb);
+       vrf_tx_error(skb->dev, skb);
        return ret;
 }
 


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