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authorFrancesco Ruggeri <fruggeri@arista.com>2016-04-24 01:03:32 +0300
committerDavid S. Miller <davem@davemloft.net>2016-04-26 22:17:18 +0300
commit308379607548524b8d86dbf20134681024935e0b (patch)
treee755097f21c7b18c56e6a30542793e2b0cd9298b /drivers/net/macvlan.c
parent713d4ddc99677499281fbacdfc8519b9d22513fa (diff)
downloadlinux-308379607548524b8d86dbf20134681024935e0b.tar.xz
macvlan: fix failure during registration v3
If macvlan_common_newlink fails in register_netdevice after macvlan_init then it decrements port->count twice, first in macvlan_uninit (from register_netdevice or rollback_registered) and then again in macvlan_common_newlink. A similar problem may exist in the ipvlan driver. This patch consolidates modifications to port->count into macvlan_init and macvlan_uninit (thanks to Eric Biederman for suggesting this approach). v3: remove macvtap specific bits. Signed-off-by: Francesco Ruggeri <fruggeri@arista.com> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvlan.c')
-rw-r--r--drivers/net/macvlan.c10
1 files changed, 4 insertions, 6 deletions
diff --git a/drivers/net/macvlan.c b/drivers/net/macvlan.c
index 2bcf1f321bea..cb01023eab41 100644
--- a/drivers/net/macvlan.c
+++ b/drivers/net/macvlan.c
@@ -795,6 +795,7 @@ static int macvlan_init(struct net_device *dev)
{
struct macvlan_dev *vlan = netdev_priv(dev);
const struct net_device *lowerdev = vlan->lowerdev;
+ struct macvlan_port *port = vlan->port;
dev->state = (dev->state & ~MACVLAN_STATE_MASK) |
(lowerdev->state & MACVLAN_STATE_MASK);
@@ -812,6 +813,8 @@ static int macvlan_init(struct net_device *dev)
if (!vlan->pcpu_stats)
return -ENOMEM;
+ port->count += 1;
+
return 0;
}
@@ -1312,10 +1315,9 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
return err;
}
- port->count += 1;
err = register_netdevice(dev);
if (err < 0)
- goto destroy_port;
+ return err;
dev->priv_flags |= IFF_MACVLAN;
err = netdev_upper_dev_link(lowerdev, dev);
@@ -1330,10 +1332,6 @@ int macvlan_common_newlink(struct net *src_net, struct net_device *dev,
unregister_netdev:
unregister_netdevice(dev);
-destroy_port:
- port->count -= 1;
- if (!port->count)
- macvlan_port_destroy(lowerdev);
return err;
}