From 494e8489db50157637d146ee377991ed6f0018f1 Mon Sep 17 00:00:00 2001 From: Mahesh Bandewar Date: Wed, 27 Apr 2016 14:59:27 -0700 Subject: [PATCH] ipvlan: Fix failure path in dev registration during link creation When newlink creation fails at device-registration, the port->count is decremented twice. Francesco Ruggeri (fruggeri@arista.com) found this issue in Macvlan and the same exists in IPvlan driver too. While fixing this issue I noticed another issue of missing unregister in case of failure, so adding it to the fix which is similar to the macvlan fix by Francesco in commit 308379607548 ("macvlan: fix failure during registration v3") Reported-by: Francesco Ruggeri Signed-off-by: Mahesh Bandewar CC: Eric Dumazet CC: Eric W. Biederman Signed-off-by: David S. Miller --- drivers/net/ipvlan/ipvlan_main.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c index 57941d3f4227..1c4d395fbd49 100644 --- a/drivers/net/ipvlan/ipvlan_main.c +++ b/drivers/net/ipvlan/ipvlan_main.c @@ -113,6 +113,7 @@ static int ipvlan_init(struct net_device *dev) { struct ipvl_dev *ipvlan = netdev_priv(dev); const struct net_device *phy_dev = ipvlan->phy_dev; + struct ipvl_port *port = ipvlan->port; dev->state = (dev->state & ~IPVLAN_STATE_MASK) | (phy_dev->state & IPVLAN_STATE_MASK); @@ -128,6 +129,8 @@ static int ipvlan_init(struct net_device *dev) if (!ipvlan->pcpu_stats) return -ENOMEM; + port->count += 1; + return 0; } @@ -481,27 +484,21 @@ static int ipvlan_link_new(struct net *src_net, struct net_device *dev, dev->priv_flags |= IFF_IPVLAN_SLAVE; - port->count += 1; err = register_netdevice(dev); if (err < 0) - goto ipvlan_destroy_port; + return err; err = netdev_upper_dev_link(phy_dev, dev); - if (err) - goto ipvlan_destroy_port; + if (err) { + unregister_netdevice(dev); + return err; + } list_add_tail_rcu(&ipvlan->pnode, &port->ipvlans); ipvlan_set_port_mode(port, mode); netif_stacked_transfer_operstate(phy_dev, dev); return 0; - -ipvlan_destroy_port: - port->count -= 1; - if (!port->count) - ipvlan_port_destroy(phy_dev); - - return err; } static void ipvlan_link_delete(struct net_device *dev, struct list_head *head) -- 2.20.1