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authorWANG Cong <xiyou.wangcong@gmail.com>2014-07-25 15:25:10 -0700
committerDavid S. Miller <davem@davemloft.net>2014-07-29 11:43:50 -0700
commit9c5ff24f963919965155cf0c4a2323b22a0c5c84 (patch)
tree8be53cca32ce634c291589f161684913f42432ac /net/8021q
parenta317a2f19da7d0af1f068cf4d3ae80cdd73643b7 (diff)
vlan: fail early when creating netdev named config
Similarly, vlan will create /proc/net/vlan/<dev>, so when we create dev with name "config", it will confict with /proc/net/vlan/config. Reported-by: Stephane Chazelas <stephane.chazelas@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/8021q')
-rw-r--r--net/8021q/vlan.c21
-rw-r--r--net/8021q/vlanproc.c2
2 files changed, 15 insertions, 8 deletions
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index cba9c212a730..64c6bed4a3d3 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -325,23 +325,24 @@ static void vlan_transfer_features(struct net_device *dev,
netdev_update_features(vlandev);
}
-static void __vlan_device_event(struct net_device *dev, unsigned long event)
+static int __vlan_device_event(struct net_device *dev, unsigned long event)
{
+ int err = 0;
+
switch (event) {
case NETDEV_CHANGENAME:
vlan_proc_rem_dev(dev);
- if (vlan_proc_add_dev(dev) < 0)
- pr_warn("failed to change proc name for %s\n",
- dev->name);
+ err = vlan_proc_add_dev(dev);
break;
case NETDEV_REGISTER:
- if (vlan_proc_add_dev(dev) < 0)
- pr_warn("failed to add proc entry for %s\n", dev->name);
+ err = vlan_proc_add_dev(dev);
break;
case NETDEV_UNREGISTER:
vlan_proc_rem_dev(dev);
break;
}
+
+ return err;
}
static int vlan_device_event(struct notifier_block *unused, unsigned long event,
@@ -356,8 +357,12 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
bool last = false;
LIST_HEAD(list);
- if (is_vlan_dev(dev))
- __vlan_device_event(dev, event);
+ if (is_vlan_dev(dev)) {
+ int err = __vlan_device_event(dev, event);
+
+ if (err)
+ return notifier_from_errno(err);
+ }
if ((event == NETDEV_UP) &&
(dev->features & NETIF_F_HW_VLAN_CTAG_FILTER)) {
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
index 1d0e89213a28..ae63cf72a953 100644
--- a/net/8021q/vlanproc.c
+++ b/net/8021q/vlanproc.c
@@ -171,6 +171,8 @@ int vlan_proc_add_dev(struct net_device *vlandev)
struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
+ if (!strcmp(vlandev->name, name_conf))
+ return -EINVAL;
vlan->dent =
proc_create_data(vlandev->name, S_IFREG|S_IRUSR|S_IWUSR,
vn->proc_vlan_dir, &vlandev_fops, vlandev);

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