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ipv4: ip_tunnel: use net namespace from rtable not socket

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The socket parameter might legally be NULL, thus sock_net is sometimes
causing a NULL pointer dereference. Using net_device pointer in dst_entry
is more reliable.

Fixes: b6a7719aedd7e5c ("ipv4: hash net ptr into fragmentation bucket selection")
Reported-by: Rick Jones <rick.jones2@hp.com>
Cc: Rick Jones <rick.jones2@hp.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2015-04-08 17:01:22 +02:00 committed by David S. Miller
parent 8bc0034cf6
commit 926a882f69
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/ip_tunnel_core.c
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@ -74,7 +74,8 @@ int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
iph->daddr = dst;
iph->saddr = src;
iph->ttl = ttl;
__ip_select_ident(sock_net(sk), iph, skb_shinfo(skb)->gso_segs ?: 1);
__ip_select_ident(dev_net(rt->dst.dev), iph,
skb_shinfo(skb)->gso_segs ?: 1);
err = ip_local_out_sk(sk, skb);
if (unlikely(net_xmit_eval(err)))