From 737e828bdbdaf2f9d7de07f20a0308ac46ce5178 Mon Sep 17 00:00:00 2001 From: Li Hongjun Date: Wed, 28 Aug 2013 11:54:50 +0200 Subject: ipv4 tunnels: fix an oops when using ipip/sit with IPsec Since commit 3d7b46cd20e3 (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 Signed-off-by: Nicolas Dichtel Signed-off-by: David S. Miller --- net/ipv4/ipip.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) (limited to 'net/ipv4/ipip.c') diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index 51fc2a1dcdd3..b3ac3c3f6219 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -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); } -- cgit v1.2.3