[PATCH 18/50] ipv6: assign rt6_info to inet6_ifaddr in init_loopback

[Luis Henriques]

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

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

From: Gao feng <gaofeng at cn.fujitsu.com>

commit 534c877928a16ae5f9776436a497109639bf67dc upstream.

Commit 25fb6ca4ed9cad72f14f61629b68dc03c0d9713f
"net IPv6 : Fix broken IPv6 routing table after loopback down-up"
forgot to assign rt6_info to the inet6_ifaddr.
When disable the net device, the rt6_info which allocated
in init_loopback will not be destroied in __ipv6_ifa_notify.

This will trigger the waring message below
[23527.916091] unregister_netdevice: waiting for tap0 to become free. Usage count = 1

Reported-by: Arkadiusz Miskiewicz <a.miskiewicz at gmail.com>
Signed-off-by: Gao feng <gaofeng at cn.fujitsu.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/ipv6/addrconf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 2078f4e..f67075b 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2435,8 +2435,10 @@ static void init_loopback(struct net_device *dev)
 			sp_rt = addrconf_dst_alloc(idev, &sp_ifa->addr, 0);
 
 			/* Failure cases are ignored */
-			if (!IS_ERR(sp_rt))
+			if (!IS_ERR(sp_rt)) {
+				sp_ifa->rt = sp_rt;
 				ip6_ins_rt(sp_rt);
+			}
 		}
 		read_unlock_bh(&idev->lock);
 	}
-- 
1.8.1.2