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| author | Michal Kubeček <mkubecek@suse.cz> | 2013-09-09 21:45:04 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-09-11 17:04:09 -0400 |
| commit | 2c861cc65ef4604011a0082e4dcdba2819aa191a (patch) | |
| tree | d6fe5436cf4d492c727cfb370232c87254d72097 /net | |
| parent | 444fa88ac35aa1bf9b7c23945444bc67f631033b (diff) | |
| download | lwn-2c861cc65ef4604011a0082e4dcdba2819aa191a.tar.gz lwn-2c861cc65ef4604011a0082e4dcdba2819aa191a.zip | |
ipv6: don't call fib6_run_gc() until routing is ready
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/af_inet6.c | 6 | ||||
| -rw-r--r-- | net/ipv6/ndisc.c | 18 |
2 files changed, 17 insertions, 7 deletions
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c index 136fe55c1a47..7c96100b021e 100644 --- a/net/ipv6/af_inet6.c +++ b/net/ipv6/af_inet6.c @@ -915,6 +915,9 @@ 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; @@ -981,6 +984,8 @@ 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 @@ -1043,6 +1048,7 @@ static void __exit inet6_exit(void) ipv6_exthdrs_exit(); addrconf_cleanup(); ip6_flowlabel_cleanup(); + ndisc_late_cleanup(); ip6_route_cleanup(); #ifdef CONFIG_PROC_FS diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 12179457b2cd..f8a55ff1971b 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1727,24 +1727,28 @@ 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 } -void ndisc_cleanup(void) +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) +{ #ifdef CONFIG_SYSCTL neigh_sysctl_unregister(&nd_tbl.parms); #endif |