linux-kernel - [PATCH 2.6.32 39/42] ipv6/addrlabel: fix ip6addrlbl

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Message-Id: <20160123141223.673440407@1wt.eu>
Date:	Sat, 23 Jan 2016 15:13:00 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Andrey Ryabinin <aryabinin@...tuozzo.com>,
	Cong Wang <cwang@...pensource.com>,
	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	"David S. Miller" <davem@...emloft.net>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 39/42] ipv6/addrlabel: fix ip6addrlbl_get()

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

From: Andrey Ryabinin <aryabinin@...tuozzo.com>

commit e459dfeeb64008b2d23bdf600f03b3605dbb8152 upstream.

ip6addrlbl_get() has never worked. If ip6addrlbl_hold() succeeded,
ip6addrlbl_get() will exit with '-ESRCH'. If ip6addrlbl_hold() failed,
ip6addrlbl_get() will use about to be free ip6addrlbl_entry pointer.

Fix this by inverting ip6addrlbl_hold() check.

Fixes: 2a8cc6c89039 ("[IPV6] ADDRCONF: Support RFC3484 configurable address selection policy table.")
Signed-off-by: Andrey Ryabinin <aryabinin@...tuozzo.com>
Reviewed-by: Cong Wang <cwang@...pensource.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
(cherry picked from commit 39b214ba1a357359f9c0be6ef8d21f2e5187567a)
Signed-off-by: Willy Tarreau <w@....eu>
---
 net/ipv6/addrlabel.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index 6ff73c4..5b1403d 100644
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -557,7 +557,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr* nlh,
 
 	rcu_read_lock();
 	p = __ipv6_addr_label(net, addr, ipv6_addr_type(addr), ifal->ifal_index);
-	if (p && ip6addrlbl_hold(p))
+	if (p && !ip6addrlbl_hold(p))
 		p = NULL;
 	lseq = ip6addrlbl_table.seq;
 	rcu_read_unlock();
-- 
1.7.12.2.21.g234cd45.dirty