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

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Message-Id: <20200508123129.264117885@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:30:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, David Wragg <david@...ve.works>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 067/312] ovs/gre,geneve: fix error path when creating an iface

From: Nicolas Dichtel <nicolas.dichtel@...nd.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@...ve.works>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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);