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: 459aa660eb1d ("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>
if (!pskb_may_pull(skb, hdrlen))
return -1;
+ gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
+
rcu_read_lock();
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (!pctx) {