vxlan: fix a free after use

[ Upstream commit 7a9f526fc3ee49b6034af2f243676ee0a27dcaa8 ]

pskb_may_pull maybe change skb->data and make eth pointer oboslete,
so eth needs to reload

Fixes: 91269e390d062 ("vxlan: using pskb_may_pull as early as possible")
Cc: Eric Dumazet <edumazet@google.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index e1b4e00..0704a04 100644 (file)
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1986,6 +1986,7 @@ static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
                                    msg->icmph.icmp6_type == NDISC_NEIGHBOUR_SOLICITATION)
                                        return neigh_reduce(dev, skb);
                }
+               eth = eth_hdr(skb);
 #endif
        }