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ipv6: don't call fib6_run_gc() until routing is ready 

commit 2c861cc65ef4604011a0082e4dcdba2819aa191a upstream.

When loading the ipv6 module, ndisc_init() is called before
ip6_route_init(). As the former registers a handler calling
fib6_run_gc(), this opens a window to run the garbage collector
before necessary data structures are initialized. If a network
device is initialized in this window, adding MAC address to it
triggers a NETDEV_CHANGEADDR event, leading to a crash in
fib6_clean_all().

Take the event handler registration out of ndisc_init() into a
separate function ndisc_late_init() and move it after
ip6_route_init().

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Cc: <stable@vger.kernel.org> # 3.10.y
Signed-off-by: Mike Manning <mmanning@brocade.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
This commit is contained in:
Michal Kubeček 2016-12-16 10:13:51 +00:00 committed by syphyr
parent 8a30f521b0
commit 7199fb8e6c
3 changed files with 19 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ndisc.h
View File

@ -190,7 +190,9 @@ static inline struct neighbour *__ipv6_neigh_lookup(struct net_device *dev, cons
}
extern int ndisc_init(void);
extern int ndisc_late_init(void);
extern void ndisc_late_cleanup(void);
extern void ndisc_cleanup(void);
extern int ndisc_rcv(struct sk_buff *skb);

6
net/ipv6/af_inet6.c
View File

@ -946,6 +946,9 @@ static int __init inet6_init(void)
err = ip6_route_init();
if (err)
goto ip6_route_fail;
err = ndisc_late_init();
if (err)
goto ndisc_late_fail;
err = ip6_flowlabel_init();
if (err)
goto ip6_flowlabel_fail;
@ -1012,6 +1015,8 @@ ipv6_exthdrs_fail:
addrconf_fail:
ip6_flowlabel_cleanup();
ip6_flowlabel_fail:
ndisc_late_cleanup();
ndisc_late_fail:
ip6_route_cleanup();
ip6_route_fail:
#ifdef CONFIG_PROC_FS
@ -1074,6 +1079,7 @@ static void __exit inet6_exit(void)
ipv6_exthdrs_exit();
addrconf_cleanup();
ip6_flowlabel_cleanup();
ndisc_late_cleanup();
ip6_route_cleanup();
#ifdef CONFIG_PROC_FS

18
net/ipv6/ndisc.c
View File

@ -1716,24 +1716,28 @@ int __init ndisc_init(void)
if (err)
goto out_unregister_pernet;
#endif
err = register_netdevice_notifier(&ndisc_netdev_notifier);
if (err)
goto out_unregister_sysctl;
out:
return err;
out_unregister_sysctl:
#ifdef CONFIG_SYSCTL
neigh_sysctl_unregister(&nd_tbl.parms);
out_unregister_pernet:
#endif
unregister_pernet_subsys(&ndisc_net_ops);
goto out;
#endif
}
int __init ndisc_late_init(void)
{
return register_netdevice_notifier(&ndisc_netdev_notifier);
}
void ndisc_late_cleanup(void)
{
unregister_netdevice_notifier(&ndisc_netdev_notifier);
}
void ndisc_cleanup(void)
{
unregister_netdevice_notifier(&ndisc_netdev_notifier);
#ifdef CONFIG_SYSCTL
neigh_sysctl_unregister(&nd_tbl.parms);
#endif