rtnl: fix error path when adding an iface with a link net

If an error occurs when the netdevice is moved to the link netns, a full cleanup
must be done.

Fixes: 317f4810e45e ("rtnl: allow to create device with IFLA_LINK_NETNSID set")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a12eecc0f976..07447d1665e6 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -2172,8 +2172,11 @@ replay:
                         goto out;
                 }
 
-                if (link_net)
+                if (link_net) {
                         err = dev_change_net_namespace(dev, dest_net, ifname);
+                        if (err < 0)
+                                unregister_netdevice(dev);
+                }
 out:
                 if (link_net)
                         put_net(link_net);