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sit: reload iphdr in ipip6_rcv

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Since iptunnel_pull_header() can call pskb_may_pull(),
we must reload any pointer that was related to skb->head.

Fixes: a09a4c8dd1 ("tunnels: Remove encapsulation offloads on decap")
Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haishuang Yan 2017-06-04 14:43:43 +08:00 committed by David S. Miller
parent 77d4b1d369
commit b699d00358
1 changed files with 1 additions and 0 deletions
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net/ipv6/sit.c
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@ -657,6 +657,7 @@ static int ipip6_rcv(struct sk_buff *skb)
if (iptunnel_pull_header(skb, 0, htons(ETH_P_IPV6),
!net_eq(tunnel->net, dev_net(tunnel->dev))))
goto out;
iph = ip_hdr(skb);
err = IP_ECN_decapsulate(iph, skb);
if (unlikely(err)) {