From 4d78b6c78ae6d87e4c1c8072f42efa716f04afb9 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Tue, 19 Apr 2005 22:48:59 -0700 Subject: [PATCH] [IPSEC]: COW skb header in UDP decap The following patch just makes the header part of the skb writeable. This is needed since we modify the IP headers just a few lines below. Signed-off-by: Herbert Xu Signed-off-by: David S. Miller --- net/ipv4/udp.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 6baddfbedca3..8a213238f287 100644 --- 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; -- 2.20.1