[PATCH net 1/1] driver: ipvlan: Fix one possible memleak in ipvlan_link_new

[fgao]

From: Gao Feng <f...@ikuai8.com>

When ipvlan_link_new fails and creates one ipvlan port, it does not
destroy the ipvlan port created. It causes mem leak and the physical
device contains invalid ipvlan data.

Signed-off-by: Gao Feng <f...@ikuai8.com>
---
 drivers/net/ipvlan/ipvlan_main.c | 17 ++++++++++++-----
 1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index f442eb3..0fef178 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -497,6 +497,7 @@ static int ipvlan_link_new(struct net *src_net, struct 
net_device *dev,
        struct net_device *phy_dev;
        int err;
        u16 mode = IPVLAN_MODE_L3;
+       bool create = false;
 
        if (!tb[IFLA_LINK])
                return -EINVAL;
@@ -513,6 +514,7 @@ static int ipvlan_link_new(struct net *src_net, struct 
net_device *dev,
                err = ipvlan_port_create(phy_dev);
                if (err < 0)
                        return err;
+               create = true;
        }
 
        if (data && data[IFLA_IPVLAN_MODE])
@@ -536,22 +538,27 @@ static int ipvlan_link_new(struct net *src_net, struct 
net_device *dev,
 
        err = register_netdevice(dev);
        if (err < 0)
-               return err;
+               goto destroy_ipvlan_port;
 
        err = netdev_upper_dev_link(phy_dev, dev);
        if (err) {
-               unregister_netdevice(dev);
-               return err;
+               goto unregister_netdev;
        }
        err = ipvlan_set_port_mode(port, mode);
        if (err) {
-               unregister_netdevice(dev);
-               return err;
+               goto unregister_netdev;
        }
 
        list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans);
        netif_stacked_transfer_operstate(phy_dev, dev);
        return 0;
+
+unregister_netdev:
+       unregister_netdevice(dev);
+destroy_ipvlan_port:
+       if (create)
+               ipvlan_port_destroy(phy_dev);
+       return err;
 }
 
 static void ipvlan_link_delete(struct net_device *dev, struct list_head *head)
-- 
1.9.1