netdev - [PATCH] ip_tunnel: fix possible rtable leak

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Date:	Fri, 6 Jun 2014 04:34:37 +0400
From:	Dmitry Popov <ixaphire@...tor.net>
To:	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	trivial@...nel.org
Subject: [PATCH] ip_tunnel: fix possible rtable leak

ip_rt_put(rt) is always called in "error" branches above, but was missed in
skb_cow_head branch. As rt is not yet bound to skb here we have to release it by 
hand.

Signed-off-by: Dmitry Popov <ixaphire@...tor.net>
---
 net/ipv4/ip_tunnel.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 2acc233..3f6135b 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -668,6 +668,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 		dev->needed_headroom = max_headroom;
 
 	if (skb_cow_head(skb, dev->needed_headroom)) {
+		ip_rt_put(rt);
 		dev->stats.tx_dropped++;
 		kfree_skb(skb);
 		return;
--
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