From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423018Ab3BANP2 (ORCPT ); Fri, 1 Feb 2013 08:15:28 -0500 Received: from mail.kernel.org ([198.145.19.201]:45801 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422817Ab3BANPT (ORCPT ); Fri, 1 Feb 2013 08:15:19 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Vitaly E. Lavrov" , Pablo Neira Ayuso Subject: [ 83/89] netfilter: xt_recent: fix namespace destroy path Date: Fri, 1 Feb 2013 14:08:38 +0100 Message-Id: <20130201130213.470814202@linuxfoundation.org> X-Mailer: git-send-email 1.8.1.2.434.g9a6c84e.dirty In-Reply-To: <20130201130207.444989281@linuxfoundation.org> References: <20130201130207.444989281@linuxfoundation.org> User-Agent: quilt/0.60-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: "Vitaly E. Lavrov" commit 665e205c16c1f902ac6763b8ce8a0a3a1dcefe59 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 Signed-off-by: Pablo Neira Ayuso Signed-off-by: Greg Kroah-Hartman --- net/netfilter/xt_recent.c | 20 ++++++++++++++++---- 1 file changed, 16 insertions(+), 4 deletions(-) --- a/net/netfilter/xt_recent.c +++ b/net/netfilter/xt_recent.c @@ -431,7 +431,8 @@ static void recent_mt_destroy(const stru 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_in 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(st 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); }