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ip_tunnel: Do not use stale inner_iph pointer.

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While sending packet skb_cow_head() can change skb header which
invalidates inner_iph pointer to skb header. Following patch
avoid using it. Found by code inspection.

This bug was introduced by commit 0e6fbc5b6c (ip_tunnels: extend
iptunnel_xmit()).

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-09-25 09:57:47 -07:00 committed by David S. Miller
parent 2d77f34334
commit d4a71b155c
1 changed files with 2 additions and 2 deletions
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4
net/ipv4/ip_tunnel.c
View File

@ -623,6 +623,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
tunnel->err_count = 0;
}
tos = ip_tunnel_ecn_encap(tos, inner_iph, skb);
ttl = tnl_params->ttl;
if (ttl == 0) {
if (skb->protocol == htons(ETH_P_IP))
@ -651,8 +652,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
}
err = iptunnel_xmit(rt, skb, fl4.saddr, fl4.daddr, protocol,
ip_tunnel_ecn_encap(tos, inner_iph, skb), ttl, df,
!net_eq(tunnel->net, dev_net(dev)));
tos, ttl, df, !net_eq(tunnel->net, dev_net(dev)));
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);
return;