linux-kernel - [PATCH 3.11 138/138] netfilter: Fix potential use after free in ip6_route_me

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Message-Id: <1401795584-22664-139-git-send-email-luis.henriques@canonical.com>
Date:	Tue,  3 Jun 2014 12:39:44 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Sergey Popovich <popovich_sergei@...l.ru>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 138/138] netfilter: Fix potential use after free in ip6_route_me_harder()

3.11.10.11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Sergey Popovich <popovich_sergei@...l.ru>

commit a8951d5814e1373807a94f79f7ccec7041325470 upstream.

Dst is released one line before we access it again with dst->error.

Fixes: 58e35d147128 netfilter: ipv6: propagate routing errors from
ip6_route_me_harder()

Signed-off-by: Sergey Popovich <popovich_sergei@...l.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/ipv6/netfilter.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index 95f3f1da0d7f..d38e6a8d8b9f 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -30,13 +30,15 @@ int ip6_route_me_harder(struct sk_buff *skb)
 		.daddr = iph->daddr,
 		.saddr = iph->saddr,
 	};
+	int err;
 
 	dst = ip6_route_output(net, skb->sk, &fl6);
-	if (dst->error) {
+	err = dst->error;
+	if (err) {
 		IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
 		LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
 		dst_release(dst);
-		return dst->error;
+		return err;
 	}
 
 	/* Drop old route. */
-- 
1.9.1

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