linux-kernel - [PATCH 4.2.y-ckt 273/305] netfilter: nfnetlink_queue: Unregister pernet subsys in case of init failure

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Date:	Fri, 15 Jan 2016 16:01:27 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Nikolay Borisov <kernel@...p.com>,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 273/305] netfilter: nfnetlink_queue: Unregister pernet subsys in case of init failure

4.2.8-ckt2 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Nikolay Borisov <kernel@...p.com>

commit 639e077b43d9c54ffb1e1b54a2de54597ceae1d8 upstream.

Commit 3bfe049807c2403 ("netfilter: nfnetlink_{log,queue}:
Register pernet in first place") reorganised the initialisation
order of the pernet_subsys to avoid "use-before-initialised"
condition. However, in doing so the cleanup logic in nfnetlink_queue
got botched in that the pernet_subsys wasn't cleaned in case
nfnetlink_subsys_register failed. This patch adds the necessary
cleanup routine call.

Fixes: 3bfe049807c2403 ("netfilter: nfnetlink_{log,queue}: Register pernet in first place")
Signed-off-by: Nikolay Borisov <kernel@...p.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
[ kamal: backport to 4.2-stable: appled to nfnetlink_queue_core.c ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 net/netfilter/nfnetlink_queue_core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c
index a5cd6d9..2bfb1fd 100644
--- a/net/netfilter/nfnetlink_queue_core.c
+++ b/net/netfilter/nfnetlink_queue_core.c
@@ -1392,6 +1392,7 @@ static int __init nfnetlink_queue_init(void)
 
 cleanup_netlink_notifier:
 	netlink_unregister_notifier(&nfqnl_rtnl_notifier);
+	unregister_pernet_subsys(&nfnl_queue_net_ops);
 out:
 	return status;
 }
-- 
1.9.1