From 2c861cc65ef4604011a0082e4dcdba2819aa191a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Michal=20Kube=C4=8Dek?= Date: Mon, 9 Sep 2013 21:45:04 +0200 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- include/net/ndisc.h | 2 ++ net/ipv6/af_inet6.c | 6 ++++++ net/ipv6/ndisc.c | 18 +++++++++++------- 3 files changed, 19 insertions(+), 7 deletions(-) diff --git a/include/net/ndisc.h b/include/net/ndisc.h index 3c4211f0bed6..ea0cc26ab70e 100644 --- a/include/net/ndisc.h +++ b/include/net/ndisc.h @@ -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); 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 -- 2.39.2