linux-kernel - [09/17] netfilter: ip6t_REJECT: fix a dst leak in ipv6 REJECT

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Date:	Fri, 30 Jul 2010 09:57:25 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Eric Dumazet <eric.dumazet@...il.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: [09/17] netfilter: ip6t_REJECT: fix a dst leak in ipv6 REJECT

2.6.27-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Eric Dumazet <eric.dumazet@...il.com>

commit 499031ac8a3df6738f6186ded9da853e8ea18253 upstream.

We should release dst if dst->error is set.

Bug introduced in 2.6.14 by commit e104411b82f5c
([XFRM]: Always release dst_entry on error in xfrm_lookup)

Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 net/ipv6/netfilter/ip6t_REJECT.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/ipv6/netfilter/ip6t_REJECT.c
+++ b/net/ipv6/netfilter/ip6t_REJECT.c
@@ -95,9 +95,11 @@ static void send_reset(struct sk_buff *o
 	fl.fl_ip_dport = otcph.source;
 	security_skb_classify_flow(oldskb, &fl);
 	dst = ip6_route_output(&init_net, NULL, &fl);
-	if (dst == NULL)
+	if (dst == NULL || dst->error) {
+		dst_release(dst);
 		return;
-	if (dst->error || xfrm_lookup(&dst, &fl, NULL, 0))
+	}
+	if (xfrm_lookup(&dst, &fl, NULL, 0))
 		return;
 
 	hh_len = (dst->dev->hard_header_len + 15)&~15;


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