[PATCH 3.10 49/56] ip6_gre: release cached dst on tunnel removal

From: Greg Kroah-Hartman
Date: Tue Sep 29 2015 - 09:50:25 EST

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


From: huaibin Wang <huaibin.wang@xxxxxxxxx>

[ Upstream commit d4257295ba1b389c693b79de857a96e4b7cd8ac0 ]

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@xxxxxxx>
Fixes: c12b395a4664 ("gre: Support GRE over IPv6")
Signed-off-by: huaibin Wang <huaibin.wang@xxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
net/ipv6/ip6_gre.c | 1 +
1 file changed, 1 insertion(+)

--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -359,6 +359,7 @@ static void ip6gre_tunnel_uninit(struct
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);

ip6gre_tunnel_unlink(ign, netdev_priv(dev));
+ ip6_tnl_dst_reset(netdev_priv(dev));

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