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Commit 2cc6d2bf authored by Neil Horman's avatar Neil Horman Committed by David S. Miller
Browse files

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: default avatarNeil 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: default avatarDavid S. Miller <davem@davemloft.net>
parent bc68580d

include/net/addrconf.h

+1 −0
Original line number Diff line number Diff line
@@ -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,

net/ipv6/addrconf.c

+8 −3
Original line number Diff line number Diff line
@@ -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();

net/ipv6/addrlabel.c

+5 −0
Original line number Diff line number Diff line
@@ -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), },