diff options
| -rw-r--r-- | net/ipv6/addrconf.c | 82 |
1 files changed, 54 insertions, 28 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 4c03c2843094..0b239fc1816e 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -108,11 +108,12 @@ static inline u32 cstamp_delta(unsigned long cstamp) } #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 @@ err_ip: 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 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 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 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 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 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 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 @@ static struct inet6_dev *ipv6_add_dev(struct net_device *dev) 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 @@ static struct inet6_dev *ipv6_find_idev(struct net_device *dev) idev = __in6_dev_get(dev); if (!idev) { idev = ipv6_add_dev(dev); - if (!idev) + if (IS_ERR(idev)) return NULL; } @@ -2830,8 +2839,8 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 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 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 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 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, break; } - if (idev) { + if (!IS_ERR_OR_NULL(idev)) { if (run_pending) addrconf_dad_run(idev); @@ -2929,7 +2938,7 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, if (!idev && dev->mtu >= IPV6_MIN_MTU) { idev = ipv6_add_dev(dev); - if (idev) + if (!IS_ERR(idev)) break; } @@ -2950,10 +2959,14 @@ static int addrconf_notify(struct notifier_block *this, unsigned long event, 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 @@ static void __addrconf_sysctl_unregister(struct ipv6_devconf *p) 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 @@ static struct rtnl_af_ops inet6_ops = { int __init addrconf_init(void) { + struct inet6_dev *idev; int i, err; err = ipv6_addr_label_init(); @@ -5376,11 +5401,12 @@ int __init addrconf_init(void) * 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]); |