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gtp: reload GTPv1 header after pskb_may_pull()

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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>
This commit is contained in:
Pablo Neira 2016-05-10 21:33:38 +02:00 committed by David S. Miller
parent 1dee3f59a8
commit 93edb8c7f9
1 changed files with 2 additions and 0 deletions
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2
drivers/net/gtp.c
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@ -253,6 +253,8 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb,
if (!pskb_may_pull(skb, hdrlen)) if (!pskb_may_pull(skb, hdrlen))
return -1; return -1;
gtp1 = (struct gtp1_header *)(skb->data + sizeof(struct udphdr));
rcu_read_lock(); rcu_read_lock();
pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid)); pctx = gtp1_pdp_find(gtp, ntohl(gtp1->tid));
if (!pctx) { if (!pctx) {