vxlan: handle skb_clone failure

If skb_clone fails if out of memory then just skip the fanout.

Problem was introduced in 3.10 with:
  commit 6681712d67eef14c4ce793561c3231659153a320
  Author: David Stevens <dlstevens@us.ibm.com>
  Date:   Fri Mar 15 04:35:51 2013 +0000

    vxlan: generalize forwarding tables

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 15a73ec42c64..dda997a0102c 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1161,9 +1161,11 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
                 struct sk_buff *skb1;
 
                 skb1 = skb_clone(skb, GFP_ATOMIC);
-                rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc);
-                if (rc == NETDEV_TX_OK)
-                        rc = rc1;
+                if (skb1) {
+                        rc1 = vxlan_xmit_one(skb1, dev, rdst, did_rsc);
+                        if (rc == NETDEV_TX_OK)
+                                rc = rc1;
+                }
         }
 
         rc1 = vxlan_xmit_one(skb, dev, rdst0, did_rsc);