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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>
This commit is contained in:
Vitaly E. Lavrov 2012-12-24 13:55:20 +01:00 committed by Pablo Neira Ayuso
parent 09181842b0
commit 665e205c16
1 changed files with 16 additions and 4 deletions
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20
net/netfilter/xt_recent.c
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@ -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);
}