[IPSEC]: COW skb header in UDP decap

[firefly-linux-kernel-4.4.55.git] / net / ipv4 / udp.c

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 6baddfbedca3f90adaef9f22e2e97d889cbdc945..8a213238f2873e8a985bf1c85b1f8f347d8f7d8c 100644 (file)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -955,6 +955,8 @@ static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
         * header and optional ESP marker bytes) and then modify the
         * protocol to ESP, and then call into the transform receiver.
         */
+       if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+               return 0;
 
        /* Now we can update and verify the packet length... */
        iph = skb->nh.iph;