netdev - [PATCH] ipv6: Fix possible NULL dereference in icmp6_dst

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Message-ID: <20100127095952.GA11635@ff.dom.local>
Date:	Wed, 27 Jan 2010 09:59:52 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	shemminger@...tta.com, djohnson@...rentnetworks.com,
	sakkiped@...rentnetworks.com, netdev@...r.kernel.org
Subject: [PATCH] ipv6: Fix possible NULL dereference in icmp6_dst_alloc

While looking at the "Deadlock in IPv6 code while garbage collection
on the rwlock protecting the routing tree" reported by Srinivas
Akkipeddi I found there is possible a NULL pointer dereference in
icmp6_dst_alloc().

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>
---

 net/ipv6/route.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index c2bd74c..93c3b20 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -973,7 +973,7 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 	rt = ip6_dst_alloc(&net->ipv6.ip6_dst_ops);
 	if (unlikely(rt == NULL)) {
 		in6_dev_put(idev);
-		goto out;
+		return NULL;
 	}
 
 	dev_hold(dev);
@@ -1009,7 +1009,6 @@ struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
 
 	fib6_force_start_gc(net);
 
-out:
 	return &rt->u.dst;
 }
 
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