netdev - [patch net-next 3/3] ipv6: check propagates sk in sk_mc

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Date:	Fri, 15 Aug 2014 20:32:56 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, kuznet@....inr.ac.ru, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, stephen@...workplumber.org,
	cwang@...pensource.com, pshelar@...ira.com,
	nicolas.dichtel@...nd.com, therbert@...gle.com,
	dborkman@...hat.com, edumazet@...gle.com
Subject: [patch net-next 3/3] ipv6: check propagates sk in sk_mc_loop instead of skb->sk

In the dst->output() path for ip6tunnel_xmit, the code assumes the skb
it has to transmit is attached to an inet socket, specifically via
ip6_finish_output2(): The sk_mc_loop() test triggers a WARN_ON() when the
provider of the packet is an AF_PACKET socket.

Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
 net/ipv6/ip6_output.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index e2c93c6..a889a96 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -70,7 +70,7 @@ static int ip6_finish_output2(struct sock *sk, struct sk_buff *skb)
 	if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
 		struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
 
-		if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(skb->sk) &&
+		if (!(dev->flags & IFF_LOOPBACK) && sk_mc_loop(sk) &&
 		    ((mroute6_socket(dev_net(dev), skb) &&
 		     !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
 		     ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
-- 
1.9.3

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