sit: reload iphdr in ipip6_rcv
Since iptunnel_pull_header() can call pskb_may_pull(), we must reload any pointer that was related to skb->head. Fixes: a09a4c8d ("tunnels: Remove encapsulation offloads on decap") Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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