ipv6: add a missing unregister_pernet_subsys call

Clean up a missing exit path in the ipv6 module init routines.  In
addrconf_init we call ipv6_addr_label_init which calls register_pernet_subsys
for the ipv6_addr_label_ops structure.  But if module loading fails, or if the
ipv6 module is removed, there is no corresponding unregister_pernet_subsys call,
which leaves a now-bogus address on the pernet_list, leading to oopses in
subsequent registrations.  This patch cleans up both the failed load path and
the unload path.  Tested by myself with good results.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
 include/net/addrconf.h |    1 +
 net/ipv6/addrconf.c    |   11 ++++++++---
 net/ipv6/addrlabel.c   |    5 +++++
 3 files changed, 14 insertions(+), 3 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 45375b4..4d40c4d 100644 (file)
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -121,6 +121,7 @@ static inline int addrconf_finite_timeout(unsigned long timeout)
  *     IPv6 Address Label subsystem (addrlabel.c)
  */
 extern int                     ipv6_addr_label_init(void);
+extern void                    ipv6_addr_label_cleanup(void);
 extern void                    ipv6_addr_label_rtnl_register(void);
 extern u32                     ipv6_addr_label(struct net *net,
                                                const struct in6_addr *addr,

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ab70a3f..324fac3 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4637,10 +4637,12 @@ int __init addrconf_init(void)
        if (err < 0) {
                printk(KERN_CRIT "IPv6 Addrconf:"
                       " cannot initialize default policy table: %d.\n", err);
-               return err;
+               goto out;
        }
 
-       register_pernet_subsys(&addrconf_ops);
+       err = register_pernet_subsys(&addrconf_ops);
+       if (err < 0)
+               goto out_addrlabel;
 
        /* The addrconf netdev notifier requires that loopback_dev
         * has it's ipv6 private information allocated and setup
@@ -4692,7 +4694,9 @@ errout:
        unregister_netdevice_notifier(&ipv6_dev_notf);
 errlo:
        unregister_pernet_subsys(&addrconf_ops);
-
+out_addrlabel:
+       ipv6_addr_label_cleanup();
+out:
        return err;
 }
 
@@ -4703,6 +4707,7 @@ void addrconf_cleanup(void)
 
        unregister_netdevice_notifier(&ipv6_dev_notf);
        unregister_pernet_subsys(&addrconf_ops);
+       ipv6_addr_label_cleanup();
 
        rtnl_lock();
 

diff --git a/net/ipv6/addrlabel.c b/net/ipv6/addrlabel.c
index f0e774c..8175f80 100644 (file)
--- a/net/ipv6/addrlabel.c
+++ b/net/ipv6/addrlabel.c
@@ -393,6 +393,11 @@ int __init ipv6_addr_label_init(void)
        return register_pernet_subsys(&ipv6_addr_label_ops);
 }
 
+void ipv6_addr_label_cleanup(void)
+{
+       unregister_pernet_subsys(&ipv6_addr_label_ops);
+}
+
 static const struct nla_policy ifal_policy[IFAL_MAX+1] = {
        [IFAL_ADDRESS]          = { .len = sizeof(struct in6_addr), },
        [IFAL_LABEL]            = { .len = sizeof(u32), },