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

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

From: Sabrina Dubroca <[email protected]>

[ 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 <[email protected]>
Signed-off-by: Sabrina Dubroca <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
 net/ipv6/addrconf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -411,6 +411,7 @@ 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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