ipv6: fail early when creating netdev named all or default
We create a proc dir for each network device, this will cause
conflicts when the devices have name "all" or "default".
Rather than emitting an ugly kernel warning, we could just
fail earlier by checking the device name.
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>
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 4c03c28..0b239fc 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -108,11 +108,12 @@
}
#ifdef CONFIG_SYSCTL
-static void addrconf_sysctl_register(struct inet6_dev *idev);
+static int addrconf_sysctl_register(struct inet6_dev *idev);
static void addrconf_sysctl_unregister(struct inet6_dev *idev);
#else
-static inline void addrconf_sysctl_register(struct inet6_dev *idev)
+static inline int addrconf_sysctl_register(struct inet6_dev *idev)
{
+ return 0;
}
static inline void addrconf_sysctl_unregister(struct inet6_dev *idev)
@@ -310,16 +311,16 @@
static struct inet6_dev *ipv6_add_dev(struct net_device *dev)
{
struct inet6_dev *ndev;
+ int err = -ENOMEM;
ASSERT_RTNL();
if (dev->mtu < IPV6_MIN_MTU)
- return NULL;
+ return ERR_PTR(-EINVAL);
ndev = kzalloc(sizeof(struct inet6_dev), GFP_KERNEL);
-
if (ndev == NULL)
- return NULL;
+ return ERR_PTR(err);
rwlock_init(&ndev->lock);
ndev->dev = dev;
@@ -332,7 +333,7 @@
ndev->nd_parms = neigh_parms_alloc(dev, &nd_tbl);
if (ndev->nd_parms == NULL) {
kfree(ndev);
- return NULL;
+ return ERR_PTR(err);
}
if (ndev->cnf.forwarding)
dev_disable_lro(dev);
@@ -346,17 +347,14 @@
neigh_parms_release(&nd_tbl, ndev->nd_parms);
dev_put(dev);
kfree(ndev);
- return NULL;
+ return ERR_PTR(err);
}
if (snmp6_register_dev(ndev) < 0) {
ADBG(KERN_WARNING
"%s: cannot create /proc/net/dev_snmp6/%s\n",
__func__, dev->name);
- neigh_parms_release(&nd_tbl, ndev->nd_parms);
- ndev->dead = 1;
- in6_dev_finish_destroy(ndev);
- return NULL;
+ goto err_release;
}
/* One reference from device. We must do this before
@@ -394,7 +392,12 @@
ipv6_mc_init_dev(ndev);
ndev->tstamp = jiffies;
- addrconf_sysctl_register(ndev);
+ err = addrconf_sysctl_register(ndev);
+ if (err) {
+ ipv6_mc_destroy_dev(ndev);
+ del_timer(&ndev->regen_timer);
+ goto err_release;
+ }
/* protected by rtnl_lock */
rcu_assign_pointer(dev->ip6_ptr, ndev);
@@ -409,6 +412,12 @@
ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
return ndev;
+
+err_release:
+ neigh_parms_release(&nd_tbl, ndev->nd_parms);
+ ndev->dead = 1;
+ in6_dev_finish_destroy(ndev);
+ return ERR_PTR(err);
}
static struct inet6_dev *ipv6_find_idev(struct net_device *dev)
@@ -420,7 +429,7 @@
idev = __in6_dev_get(dev);
if (!idev) {
idev = ipv6_add_dev(dev);
- if (!idev)
+ if (IS_ERR(idev))
return NULL;
}
@@ -2830,8 +2839,8 @@
case NETDEV_REGISTER:
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
- if (!idev)
- return notifier_from_errno(-ENOMEM);
+ if (IS_ERR(idev))
+ return notifier_from_errno(PTR_ERR(idev));
}
break;
@@ -2851,7 +2860,7 @@
if (!idev && dev->mtu >= IPV6_MIN_MTU)
idev = ipv6_add_dev(dev);
- if (idev) {
+ if (!IS_ERR_OR_NULL(idev)) {
idev->if_flags |= IF_READY;
run_pending = 1;
}
@@ -2894,7 +2903,7 @@
break;
}
- if (idev) {
+ if (!IS_ERR_OR_NULL(idev)) {
if (run_pending)
addrconf_dad_run(idev);
@@ -2929,7 +2938,7 @@
if (!idev && dev->mtu >= IPV6_MIN_MTU) {
idev = ipv6_add_dev(dev);
- if (idev)
+ if (!IS_ERR(idev))
break;
}
@@ -2950,10 +2959,14 @@
if (idev) {
snmp6_unregister_dev(idev);
addrconf_sysctl_unregister(idev);
- addrconf_sysctl_register(idev);
- err = snmp6_register_dev(idev);
+ err = addrconf_sysctl_register(idev);
if (err)
return notifier_from_errno(err);
+ err = snmp6_register_dev(idev);
+ if (err) {
+ addrconf_sysctl_unregister(idev);
+ return notifier_from_errno(err);
+ }
}
break;
@@ -5248,12 +5261,23 @@
kfree(t);
}
-static void addrconf_sysctl_register(struct inet6_dev *idev)
+static int addrconf_sysctl_register(struct inet6_dev *idev)
{
- neigh_sysctl_register(idev->dev, idev->nd_parms,
- &ndisc_ifinfo_sysctl_change);
- __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
- idev, &idev->cnf);
+ int err;
+
+ if (!sysctl_dev_name_is_allowed(idev->dev->name))
+ return -EINVAL;
+
+ err = neigh_sysctl_register(idev->dev, idev->nd_parms,
+ &ndisc_ifinfo_sysctl_change);
+ if (err)
+ return err;
+ err = __addrconf_sysctl_register(dev_net(idev->dev), idev->dev->name,
+ idev, &idev->cnf);
+ if (err)
+ neigh_sysctl_unregister(idev->nd_parms);
+
+ return err;
}
static void addrconf_sysctl_unregister(struct inet6_dev *idev)
@@ -5338,6 +5362,7 @@
int __init addrconf_init(void)
{
+ struct inet6_dev *idev;
int i, err;
err = ipv6_addr_label_init();
@@ -5376,11 +5401,12 @@
* device and it being up should be removed.
*/
rtnl_lock();
- if (!ipv6_add_dev(init_net.loopback_dev))
- err = -ENOMEM;
+ idev = ipv6_add_dev(init_net.loopback_dev);
rtnl_unlock();
- if (err)
+ if (IS_ERR(idev)) {
+ err = PTR_ERR(idev);
goto errlo;
+ }
for (i = 0; i < IN6_ADDR_HSIZE; i++)
INIT_HLIST_HEAD(&inet6_addr_lst[i]);
