ipv6: fix missing in6_ifa_put in addrconf

Fix ref count bug introduced by

commit 2de795707294972f6c34bae9de713e502c431296
Author: Lorenzo Colitti <lorenzo@google.com>
Date:   Wed Oct 27 18:16:49 2010 +0000

ipv6: addrconf: don't remove address state on ifdown if the address
is being kept

Fix logic so that addrconf_ifdown() decrements the inet6_ifaddr
refcnt correctly with in6_ifa_put().

Reported-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: John Fastabend <john.r.fastabend@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 3 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2fc35b32df9e..23cc8e1ce8d4 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2758,13 +2758,13 @@ static int addrconf_ifdown(struct net_device *dev, int how)
                         ifa->state = INET6_IFADDR_STATE_DEAD;
                         spin_unlock_bh(&ifa->state_lock);
 
-                        if (state == INET6_IFADDR_STATE_DEAD) {
-                                in6_ifa_put(ifa);
-                        } else {
+                        if (state != INET6_IFADDR_STATE_DEAD) {
                                 __ipv6_ifa_notify(RTM_DELADDR, ifa);
                                 atomic_notifier_call_chain(&inet6addr_chain,
                                                            NETDEV_DOWN, ifa);
                         }
+
+                        in6_ifa_put(ifa);
                         write_lock_bh(&idev->lock);
                 }
         }