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Subject[ 81/89] netfilter: xt_hashlimit: fix namespace destroy path
Date
3.7-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Vitaly E. Lavrov" <lve@guap.ru>

commit 32263dd1b43378b4f7d7796ed713f77e95f27e8a upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
net/netfilter/xt_hashlimit.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)

--- a/net/netfilter/xt_hashlimit.c
+++ b/net/netfilter/xt_hashlimit.c
@@ -318,7 +318,10 @@ static void htable_destroy(struct xt_has
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);
}
@@ -856,6 +859,27 @@ static int __net_init hashlimit_proc_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");
@@ -872,9 +896,6 @@ static int __net_init hashlimit_net_init

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);
}




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