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Message-Id: <1406327110-17227-4-git-send-email-xiyou.wangcong@gmail.com>
Date: Fri, 25 Jul 2014 15:25:10 -0700
From: Cong Wang <xiyou.wangcong@...il.com>
To: netdev@...r.kernel.org
Cc: stephane.chazelas@...il.com, f.fainelli@...il.com,
davem@...emloft.net, Cong Wang <xiyou.wangcong@...il.com>
Subject: [Patch net-next v2 3/3] 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@...il.com>
Cc: "David S. Miller" <davem@...emloft.net>
Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>
---
net/8021q/vlan.c | 21 +++++++++++++--------
net/8021q/vlanproc.c | 2 ++
2 files changed, 15 insertions(+), 8 deletions(-)
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index cba9c21..64c6bed 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 1d0e8921..ae63cf7 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);
--
1.8.3.1
--
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