diff options
| author | Vitaly E. Lavrov <lve@guap.ru> | 2012-12-24 13:55:20 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2012-12-26 18:14:48 +0100 |
| commit | 665e205c16c1f902ac6763b8ce8a0a3a1dcefe59 (patch) | |
| tree | df165b4009ded7206cf357d75a62f042bbb3c910 | |
| parent | netfilter: xt_hashlimit: fix race that results in duplicated entries (diff) | |
| download | linux-665e205c16c1f902ac6763b8ce8a0a3a1dcefe59.tar.xz linux-665e205c16c1f902ac6763b8ce8a0a3a1dcefe59.zip | |
netfilter: xt_recent: fix namespace destroy path
recent_net_exit() is called before recent_mt_destroy() in the
destroy path of network namespaces. Make sure there are no entries
in the parent proc entry xt_recent before removing it.
Signed-off-by: Vitaly E. Lavrov <lve@guap.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/xt_recent.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/net/netfilter/xt_recent.c b/net/netfilter/xt_recent.c index 4635c9b00459..dab053e2a1a2 100644 --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -431,7 +431,8 @@ static void recent_mt_destroy(const struct xt_mtdtor_param *par) list_del(&t->list); spin_unlock_bh(&recent_lock); #ifdef CONFIG_PROC_FS - remove_proc_entry(t->name, recent_net->xt_recent); + if (recent_net->xt_recent != NULL) + remove_proc_entry(t->name, recent_net->xt_recent); #endif recent_table_flush(t); kfree(t); @@ -615,6 +616,20 @@ static int __net_init recent_proc_net_init(struct net *net) static void __net_exit recent_proc_net_exit(struct net *net) { + struct recent_net *recent_net = recent_pernet(net); + struct recent_table *t; + + /* recent_net_exit() is called before recent_mt_destroy(). Make sure + * that the parent xt_recent proc entry is is empty before trying to + * remove it. + */ + spin_lock_bh(&recent_lock); + list_for_each_entry(t, &recent_net->tables, list) + remove_proc_entry(t->name, recent_net->xt_recent); + + recent_net->xt_recent = NULL; + spin_unlock_bh(&recent_lock); + proc_net_remove(net, "xt_recent"); } #else @@ -638,9 +653,6 @@ static int __net_init recent_net_init(struct net *net) static void __net_exit recent_net_exit(struct net *net) { - struct recent_net *recent_net = recent_pernet(net); - - BUG_ON(!list_empty(&recent_net->tables)); recent_proc_net_exit(net); } |