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authorWANG Cong <xiyou.wangcong@gmail.com>2014-07-25 15:25:08 -0700
committerDavid S. Miller <davem@davemloft.net>2014-07-29 11:43:50 -0700
commit20e61da7ffcfd84a1b6f797e745608572e5bc218 (patch)
tree19738d56563acf91956bb2a0b44de9ff2e1640cd /net/ipv4
parent9d7e3ea73c6be20538a69c14ab8bfb3b36f8d1a8 (diff)
downloadlinux-20e61da7ffcfd84a1b6f797e745608572e5bc218.tar.bz2
ipv4: 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>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/devinet.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e9449376b58e..214882e7d6de 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -180,11 +180,12 @@ static BLOCKING_NOTIFIER_HEAD(inetaddr_chain);
static void inet_del_ifa(struct in_device *in_dev, struct in_ifaddr **ifap,
int destroy);
#ifdef CONFIG_SYSCTL
-static void devinet_sysctl_register(struct in_device *idev);
+static int devinet_sysctl_register(struct in_device *idev);
static void devinet_sysctl_unregister(struct in_device *idev);
#else
-static void devinet_sysctl_register(struct in_device *idev)
+static int devinet_sysctl_register(struct in_device *idev)
{
+ return 0;
}
static void devinet_sysctl_unregister(struct in_device *idev)
{
@@ -232,6 +233,7 @@ EXPORT_SYMBOL(in_dev_finish_destroy);
static struct in_device *inetdev_init(struct net_device *dev)
{
struct in_device *in_dev;
+ int err = -ENOMEM;
ASSERT_RTNL();
@@ -252,7 +254,13 @@ static struct in_device *inetdev_init(struct net_device *dev)
/* Account for reference dev->ip_ptr (below) */
in_dev_hold(in_dev);
- devinet_sysctl_register(in_dev);
+ err = devinet_sysctl_register(in_dev);
+ if (err) {
+ in_dev->dead = 1;
+ in_dev_put(in_dev);
+ in_dev = NULL;
+ goto out;
+ }
ip_mc_init_dev(in_dev);
if (dev->flags & IFF_UP)
ip_mc_up(in_dev);
@@ -260,7 +268,7 @@ static struct in_device *inetdev_init(struct net_device *dev)
/* we can receive as soon as ip_ptr is set -- do this last */
rcu_assign_pointer(dev->ip_ptr, in_dev);
out:
- return in_dev;
+ return in_dev ?: ERR_PTR(err);
out_kfree:
kfree(in_dev);
in_dev = NULL;
@@ -1347,8 +1355,8 @@ static int inetdev_event(struct notifier_block *this, unsigned long event,
if (!in_dev) {
if (event == NETDEV_REGISTER) {
in_dev = inetdev_init(dev);
- if (!in_dev)
- return notifier_from_errno(-ENOMEM);
+ if (IS_ERR(in_dev))
+ return notifier_from_errno(PTR_ERR(in_dev));
if (dev->flags & IFF_LOOPBACK) {
IN_DEV_CONF_SET(in_dev, NOXFRM, 1);
IN_DEV_CONF_SET(in_dev, NOPOLICY, 1);
@@ -2182,11 +2190,21 @@ static void __devinet_sysctl_unregister(struct ipv4_devconf *cnf)
kfree(t);
}
-static void devinet_sysctl_register(struct in_device *idev)
+static int devinet_sysctl_register(struct in_device *idev)
{
- neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
- __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
+ int err;
+
+ if (!sysctl_dev_name_is_allowed(idev->dev->name))
+ return -EINVAL;
+
+ err = neigh_sysctl_register(idev->dev, idev->arp_parms, NULL);
+ if (err)
+ return err;
+ err = __devinet_sysctl_register(dev_net(idev->dev), idev->dev->name,
&idev->cnf);
+ if (err)
+ neigh_sysctl_unregister(idev->arp_parms);
+ return err;
}
static void devinet_sysctl_unregister(struct in_device *idev)