gtp: reload GTPv1 header after pskb_may_pull()
The GTPv1 header flags indicate the presence of optional extensions
after this header. Refresh the pointer to the GTPv1 header as skb->head
might have be reallocated via pskb_may_pull().
Fixes: 459aa660eb
("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -253,6 +253,8 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
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if (!pskb_may_pull(skb, hdrlen))
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return -1;
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gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
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rcu_read_lock();
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pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
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if (!pctx) {
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