vxlan: fix potential NULL dereference in arp_reduce()

[ Upstream commit 7346135dcd3f9b57f30a5512094848c678d7143e ]

This patch fixes a NULL pointer dereference in the event of an
skb allocation failure in arp_reduce().

Signed-Off-By: David L Stevens <dlstevens@us.ibm.com>
Acked-by: Cong Wang <cwang@twopensource.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 32c45c3..020fe03 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1212,6 +1212,9 @@ static int arp_reduce(struct net_device *dev, struct sk_buff *skb)
 
                neigh_release(n);
 
+               if (reply == NULL)
+                       goto out;
+
                skb_reset_mac_header(reply);
                __skb_pull(reply, skb_network_offset(reply));
                reply->ip_summed = CHECKSUM_UNNECESSARY;