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Commit 93edb8c7 authored by Pablo Neira's avatar Pablo Neira Committed by David S. Miller
Browse files

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: 459aa660 ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Reported-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: default avatarPablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1dee3f59

drivers/net/gtp.c

+2 −0
Original line number Diff line number Diff line
@@ -253,6 +253,8 @@ static int gtp1u_udp_encap_recv(struct gtp_dev *gtp, struct sk_buff *skb, 
	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) {