act_nat: fix wild pointer
pskb_may_pull() may change skb pointers, so adjust icmph after pskb_may_pull(). Signed-off-by: NChangli Gao <xiaosuo@gmail.com> Acked-by: NHerbert Xu <herbert@gondor.apana.org.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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