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ipv4 tunnels: fix an oops when using ipip/sit with IPsec

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Since commit 3d7b46cd20 (ip_tunnel: push generic protocol handling to
ip_tunnel module.), an Oops is triggered when an xfrm policy is configured on
an IPv4 over IPv4 tunnel.

xfrm4_policy_check() calls __xfrm_policy_check2(), which uses skb_dst(skb). But
this field is NULL because iptunnel_pull_header() calls skb_dst_drop(skb).

Signed-off-by: Li Hongjun <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Li Hongjun 2013-08-28 11:54:50 +02:00 • committed by David S. Miller
commit 737e828bdb
2 changed files with 4 additions and 7 deletions
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5
net/ipv4/ipip.c
View file

@ -190,15 +190,14 @@ static int ipip_rcv(struct sk_buff *skb)
struct ip_tunnel *tunnel;
const struct iphdr *iph;
if (iptunnel_pull_header(skb, 0, tpi.proto))
goto drop;
iph = ip_hdr(skb);
tunnel = ip_tunnel_lookup(itn, skb->dev->ifindex, TUNNEL_NO_KEY,
iph->saddr, iph->daddr, 0);
if (tunnel) {
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
goto drop;
if (iptunnel_pull_header(skb, 0, tpi.proto))
goto drop;
return ip_tunnel_rcv(tunnel, skb, &tpi, log_ecn_error);
}