vti6: fix uninit when using x-netns

[ Upstream commit 092a29a40bab8bb4530bb3e58a0597001cdecdef ]

When the kernel deleted a vti6 interface, this interface was not removed from
the tunnels list. Thus, when the ip6_vti module was removed, this old interface
was found and the kernel tried to delete it again. This was leading to a kernel
panic.

Fixes: 61220ab34948 ("vti6: Enable namespace changing")
Signed-off-by: Yao Xiwei <xiwei.yao@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index bcda14de7f84822a17b382a6256e49b665ed7a83..2459b7b0f7056a90566c12701b7013a9629758cf 100644 (file)
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -271,8 +271,7 @@ static struct ip6_tnl *vti6_locate(struct net *net, struct __ip6_tnl_parm *p,
 static void vti6_dev_uninit(struct net_device *dev)
 {
        struct ip6_tnl *t = netdev_priv(dev);
-       struct net *net = dev_net(dev);
-       struct vti6_net *ip6n = net_generic(net, vti6_net_id);
+       struct vti6_net *ip6n = net_generic(t->net, vti6_net_id);
 
        if (dev == ip6n->fb_tnl_dev)
                RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);