[PATCH 4.4 067/312] ovs/gre,geneve: fix error path when creating an iface

[Greg Kroah-Hartman]

From: Nicolas Dichtel <nicolas.dich...@6wind.com>

commit 106da663ff495e0aea3ac15b8317aa410754fcac upstream.

After ipgre_newlink()/geneve_configure() call, the netdev is registered.

Fixes: 7e059158d57b ("vxlan, gre, geneve: Set a large MTU on ovs-created tunnel 
devices")
CC: David Wragg <david@weave.works>
Signed-off-by: Nicolas Dichtel <nicolas.dich...@6wind.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/net/geneve.c |   10 +++++++---
 net/ipv4/ip_gre.c    |   10 +++++++---
 2 files changed, 14 insertions(+), 6 deletions(-)

--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1340,6 +1340,7 @@ struct net_device *geneve_dev_create_fb(
 {
        struct nlattr *tb[IFLA_MAX + 1];
        struct net_device *dev;
+       LIST_HEAD(list_kill);
        int err;
 
        memset(tb, 0, sizeof(tb));
@@ -1350,8 +1351,10 @@ struct net_device *geneve_dev_create_fb(
 
        err = geneve_configure(net, dev, &geneve_remote_unspec,
                               0, 0, 0, htons(dst_port), true);
-       if (err)
-               goto err;
+       if (err) {
+               free_netdev(dev);
+               return ERR_PTR(err);
+       }
 
        /* openvswitch users expect packet sizes to be unrestricted,
         * so set the largest MTU we can.
@@ -1363,7 +1366,8 @@ struct net_device *geneve_dev_create_fb(
        return dev;
 
  err:
-       free_netdev(dev);
+       geneve_dellink(dev, &list_kill);
+       unregister_netdevice_many(&list_kill);
        return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(geneve_dev_create_fb);
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -1230,6 +1230,7 @@ struct net_device *gretap_fb_dev_create(
 {
        struct nlattr *tb[IFLA_MAX + 1];
        struct net_device *dev;
+       LIST_HEAD(list_kill);
        struct ip_tunnel *t;
        int err;
 
@@ -1245,8 +1246,10 @@ struct net_device *gretap_fb_dev_create(
        t->collect_md = true;
 
        err = ipgre_newlink(net, dev, tb, NULL);
-       if (err < 0)
-               goto out;
+       if (err < 0) {
+               free_netdev(dev);
+               return ERR_PTR(err);
+       }
 
        /* openvswitch users expect packet sizes to be unrestricted,
         * so set the largest MTU we can.
@@ -1257,7 +1260,8 @@ struct net_device *gretap_fb_dev_create(
 
        return dev;
 out:
-       free_netdev(dev);
+       ip_tunnel_dellink(dev, &list_kill);
+       unregister_netdevice_many(&list_kill);
        return ERR_PTR(err);
 }
 EXPORT_SYMBOL_GPL(gretap_fb_dev_create);