From f16d3d57486cd079b29ae7a6c3b31c90e69c9c44 Mon Sep 17 00:00:00 2001
From: Jiri Pirko <jpirko@redhat.com>
Date: Mon, 24 May 2010 07:02:25 +0000
Subject: macvlan: do proper cleanup in macvlan_common_newlink() V2

Fixes possible memory leak.

Signed-off-by: Jiri Pirko <jpirko@redhat.com>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 4e238af..87e8d4c 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -634,11 +634,18 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
 
 	err = register_netdevice(dev);
 	if (err < 0)
-		return err;
+		goto destroy_port;
 
 	list_add_tail(&vlan->list, &port->vlans);
 	netif_stacked_transfer_operstate(lowerdev, dev);
+
 	return 0;
+
+destroy_port:
+	if (list_empty(&port->vlans))
+		macvlan_port_destroy(lowerdev);
+
+	return err;
 }
 EXPORT_SYMBOL_GPL(macvlan_common_newlink);
 
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