linux-kernel - [PATCH 4.3 013/125] ipv6: clean up dev_snmp6 proc entry when we fail to initialize inet6

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Message-Id: <20151207145752.904919609@linuxfoundation.org>
Date:	Mon,  7 Dec 2015 10:00:26 -0500
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
	Sabrina Dubroca <sd@...asysnail.net>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.3 013/125] ipv6: clean up dev_snmp6 proc entry when we fail to initialize inet6_dev

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

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

From: Sabrina Dubroca <sd@...asysnail.net>

[ Upstream commit 2a189f9e57650e9f310ddf4aad75d66c1233a064 ]

In ipv6_add_dev, when addrconf_sysctl_register fails, we do not clean up
the dev_snmp6 entry that we have already registered for this device.
Call snmp6_unregister_dev in this case.

Fixes: a317a2f19da7d ("ipv6: fail early when creating netdev named all or default")
Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/addrconf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -417,6 +417,7 @@ static struct inet6_dev *ipv6_add_dev(st
 	if (err) {
 		ipv6_mc_destroy_dev(ndev);
 		del_timer(&ndev->regen_timer);
+		snmp6_unregister_dev(ndev);
 		goto err_release;
 	}
 	/* protected by rtnl_lock */


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