netfilter: xt_hashlimit: 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>

diff --git a/net/netfilter/xt_hashlimit.c b/net/netfilter/xt_hashlimit.c
index cc430f9..a9d7af9 100644 (file)
--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -329,7 +329,10 @@ static void htable_destroy(struct xt_hashlimit_htable *hinfo)
                parent = hashlimit_net->ipt_hashlimit;
        else
                parent = hashlimit_net->ip6t_hashlimit;
-       remove_proc_entry(hinfo->pde->name, parent);
+
+       if(parent != NULL)
+               remove_proc_entry(hinfo->pde->name, parent);
+
        htable_selective_cleanup(hinfo, select_all);
        vfree(hinfo);
 }
@@ -873,6 +876,27 @@ static int __net_init hashlimit_proc_net_init(struct net *net)
 
 static void __net_exit hashlimit_proc_net_exit(struct net *net)
 {
+       struct xt_hashlimit_htable *hinfo;
+       struct hlist_node *pos;
+       struct proc_dir_entry *pde;
+       struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
+
+       /* 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.
+        */
+       mutex_lock(&hashlimit_mutex);
+       pde = hashlimit_net->ipt_hashlimit;
+       if (pde == NULL)
+               pde = hashlimit_net->ip6t_hashlimit;
+
+       hlist_for_each_entry(hinfo, pos, &hashlimit_net->htables, node)
+               remove_proc_entry(hinfo->pde->name, pde);
+
+       hashlimit_net->ipt_hashlimit = NULL;
+       hashlimit_net->ip6t_hashlimit = NULL;
+       mutex_unlock(&hashlimit_mutex);
+
        proc_net_remove(net, "ipt_hashlimit");
 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
        proc_net_remove(net, "ip6t_hashlimit");
@@ -889,9 +913,6 @@ static int __net_init hashlimit_net_init(struct net *net)
 
 static void __net_exit hashlimit_net_exit(struct net *net)
 {
-       struct hashlimit_net *hashlimit_net = hashlimit_pernet(net);
-
-       BUG_ON(!hlist_empty(&hashlimit_net->htables));
        hashlimit_proc_net_exit(net);
 }