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ipv6: l2tp: fix a potential issue in l2tp_ip6_recv 

pskb_may_pull() can change skb->data, so we have to load ptr/optr at the
right place.

Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Haishuang Yan 2016-04-03 22:09:24 +08:00 committed by David S. Miller
parent 5745b8232e
commit be447f3054
1 changed files with 5 additions and 3 deletions
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8
net/l2tp/l2tp_ip6.c
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@ -136,12 +136,11 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
struct l2tp_tunnel *tunnel = NULL;
int length;
/* Point to L2TP header */
optr = ptr = skb->data;
if (!pskb_may_pull(skb, 4))
goto discard;
/* Point to L2TP header */
optr = ptr = skb->data;
session_id = ntohl(*((__be32 *) ptr));
ptr += 4;
@ -169,6 +168,9 @@ static int l2tp_ip6_recv(struct sk_buff *skb)
if (!pskb_may_pull(skb, length))
goto discard;
/* Point to L2TP header */
optr = ptr = skb->data;
ptr += 4;
pr_debug("%s: ip recv\n", tunnel->name);
print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, ptr, length);
}