From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756231Ab3JKU7y (ORCPT ); Fri, 11 Oct 2013 16:59:54 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:45305 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757895Ab3JKThL (ORCPT ); Fri, 11 Oct 2013 15:37:11 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Salam Noureddine , "David S. Miller" Subject: [ 18/48] ipv6 mcast: use in6_dev_put in timer handlers instead of __in6_dev_put Date: Fri, 11 Oct 2013 12:36:25 -0700 Message-Id: <20131011193639.238332626@linuxfoundation.org> X-Mailer: git-send-email 1.8.4.3.gca3854a In-Reply-To: <20131011193637.253208688@linuxfoundation.org> References: <20131011193637.253208688@linuxfoundation.org> User-Agent: quilt/0.60-5.1.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Salam Noureddine [ Upstream commit 9260d3e1013701aa814d10c8fc6a9f92bd17d643 ] It is possible for the timer handlers to run after the call to ipv6_mc_down so use in6_dev_put instead of __in6_dev_put in the handler function in order to do proper cleanup when the refcnt reaches 0. Otherwise, the refcnt can reach zero without the inet6_dev being destroyed and we end up leaking a reference to the net_device and see messages like the following, unregister_netdevice: waiting for eth0 to become free. Usage count = 1 Tested on linux-3.4.43. Signed-off-by: Salam Noureddine Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv6/mcast.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/ipv6/mcast.c +++ b/net/ipv6/mcast.c @@ -2149,7 +2149,7 @@ static void mld_gq_timer_expire(unsigned idev->mc_gq_running = 0; mld_send_report(idev, NULL); - __in6_dev_put(idev); + in6_dev_put(idev); } static void mld_ifc_timer_expire(unsigned long data) @@ -2162,7 +2162,7 @@ static void mld_ifc_timer_expire(unsigne if (idev->mc_ifc_count) mld_ifc_start_timer(idev, idev->mc_maxdelay); } - __in6_dev_put(idev); + in6_dev_put(idev); } static void mld_ifc_event(struct inet6_dev *idev)