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authorWANG Cong <xiyou.wangcong@gmail.com>2017-05-03 22:07:31 -0700
committerDavid S. Miller <davem@davemloft.net>2017-05-04 12:51:24 -0400
commit2f460933f58eee3393aba64f0f6d14acb08d1724 (patch)
tree5eff3f149bacb8eb34e870855d9623de077d85de /net
parent15981952e8d04fa3349cd8db10f46ab3273ff398 (diff)
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>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/addrconf.c2
-rw-r--r--net/ipv6/route.c26
2 files changed, 17 insertions, 11 deletions
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a2a370b71249..77a4bd526d6e 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -6573,6 +6573,8 @@ int __init addrconf_init(void)
goto errlo;
}
+ ip6_route_init_special_entries();
+
for (i = 0; i < IN6_ADDR_HSIZE; i++)
INIT_HLIST_HEAD(&inet6_addr_lst[i]);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index a1bf426c959b..2f1136627dcb 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4027,6 +4027,21 @@ static struct notifier_block ip6_route_dev_notifier = {
.priority = 0,
};
+void __init ip6_route_init_special_entries(void)
+{
+ /* Registering of the loopback is done before this portion of code,
+ * the loopback reference in rt6_info will not be taken, do it
+ * manually for init_net */
+ init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #ifdef CONFIG_IPV6_MULTIPLE_TABLES
+ init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
+ init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
+ #endif
+}
+
int __init ip6_route_init(void)
{
int ret;
@@ -4053,17 +4068,6 @@ int __init ip6_route_init(void)
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
- /* Registering of the loopback is done before this portion of code,
- * the loopback reference in rt6_info will not be taken, do it
- * manually for init_net */
- init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
- init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
- #ifdef CONFIG_IPV6_MULTIPLE_TABLES
- init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
- init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
- init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
- init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
- #endif
ret = fib6_init();
if (ret)
goto out_register_subsys;