[3.16.y-ckt stable] Patch "ip6_gre: release cached dst on tunnel removal" has been added to staging queue

Luis Henriques luis.henriques at canonical.com
Thu Sep 3 10:38:06 UTC 2015


This is a note to let you know that I have just added a patch titled

    ip6_gre: release cached dst on tunnel removal

to the linux-3.16.y-queue branch of the 3.16.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-3.16.y-queue

This patch is scheduled to be released in version 3.16.7-ckt17.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.16.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 4caa61fce876aa36ceb38b0e1ce82b89c5040de1 Mon Sep 17 00:00:00 2001
From: huaibin Wang <huaibin.wang at 6wind.com>
Date: Tue, 25 Aug 2015 16:20:34 +0200
Subject: ip6_gre: release cached dst on tunnel removal

commit d4257295ba1b389c693b79de857a96e4b7cd8ac0 upstream.

When a tunnel is deleted, the cached dst entry should be released.

This problem may prevent the removal of a netns (seen with a x-netns IPv6
gre tunnel):
  unregister_netdevice: waiting for lo to become free. Usage count = 3

CC: Dmitry Kozlov <xeb at mail.ru>
Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Signed-off-by: huaibin Wang <huaibin.wang at 6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel at 6wind.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 net/ipv6/ip6_gre.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 07506e7a8917..f5ea5aaf75f9 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -358,6 +358,7 @@ static void ip6gre_tunnel_uninit(struct net_device *dev)
 	struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);

 	ip6gre_tunnel_unlink(ign, t);
+	ip6_tnl_dst_reset(t);
 	dev_put(dev);
 }





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