netdev - [PATCH net] ipv6: clean up dev_snmp6 proc entry when we fail to initialize inet6

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Date:	Tue,  3 Nov 2015 19:09:09 +0100
From:	Sabrina Dubroca <sd@...asysnail.net>
To:	netdev@...r.kernel.org
Cc:	eric.dumazet@...il.com, dvyukov@...gle.com,
	hannes@...essinduktion.org, Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net] ipv6: clean up dev_snmp6 proc entry when we fail to initialize inet6_dev

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.

It is safe to call snmp6_unregister_dev unconditionally from
in6_dev_finish_destroy, so do it.

Reported-by: Dmitry Vyukov <dvyukov@...gle.com>
Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
---
Dmitry, I'm not completely sure it's the issue you're triggering, but
it sems likely.

 net/ipv6/addrconf_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index bfa941fc1165..96248a333197 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -168,6 +168,8 @@ void in6_dev_finish_destroy(struct inet6_dev *idev)
 		pr_warn("Freeing alive inet6 device %p\n", idev);
 		return;
 	}
+
+	snmp6_unregister_dev(idev);
 	call_rcu(&idev->rcu, in6_dev_finish_destroy_rcu);
 }
 EXPORT_SYMBOL(in6_dev_finish_destroy);
-- 
2.6.2

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