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ipv6: initialize route null entry in addrconf_init()
Andrey reported a crash on init_net.ipv6.ip6_null_entry->rt6i_idev since it is always NULL. This is clearly wrong, we have code to initialize it to loopback_dev, unfortunately the order is still not correct. loopback_dev is registered very early during boot, we lose a chance to re-initialize it in notifier. addrconf_init() is called after ip6_route_init(), which means we have no chance to correct it. Fix it by moving this initialization explicitly after ipv6_add_dev(init_net.loopback_dev) in addrconf_init(). Reported-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Tested-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -84,6 +84,7 @@ struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
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struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
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struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
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int ifindex, struct flowi6 *fl6, int flags);
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int ifindex, struct flowi6 *fl6, int flags);
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void ip6_route_init_special_entries(void);
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int ip6_route_init(void);
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int ip6_route_init(void);
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void ip6_route_cleanup(void);
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void ip6_route_cleanup(void);
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@ -6573,6 +6573,8 @@ int __init addrconf_init(void)
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goto errlo;
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goto errlo;
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}
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}
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ip6_route_init_special_entries();
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for (i = 0; i < IN6_ADDR_HSIZE; i++)
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for (i = 0; i < IN6_ADDR_HSIZE; i++)
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INIT_HLIST_HEAD(&inet6_addr_lst[i]);
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INIT_HLIST_HEAD(&inet6_addr_lst[i]);
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@ -4027,6 +4027,21 @@ static struct notifier_block ip6_route_dev_notifier = {
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.priority = 0,
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.priority = 0,
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};
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};
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void __init ip6_route_init_special_entries(void)
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{
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/* Registering of the loopback is done before this portion of code,
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* the loopback reference in rt6_info will not be taken, do it
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* manually for init_net */
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init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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#endif
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}
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int __init ip6_route_init(void)
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int __init ip6_route_init(void)
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{
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{
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int ret;
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int ret;
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@ -4053,17 +4068,6 @@ int __init ip6_route_init(void)
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ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
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ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
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/* Registering of the loopback is done before this portion of code,
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* the loopback reference in rt6_info will not be taken, do it
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* manually for init_net */
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init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
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init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
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#endif
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ret = fib6_init();
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ret = fib6_init();
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if (ret)
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if (ret)
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goto out_register_subsys;
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goto out_register_subsys;
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