From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.kernel.org ([198.145.29.99]:49538 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728410AbeJSCBr (ORCPT ); Thu, 18 Oct 2018 22:01:47 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marek Lindner , Sven Eckelmann , Simon Wunderlich , Sasha Levin Subject: [PATCH 4.14 11/41] batman-adv: fix hardif_neigh refcount on queue_work() failure Date: Thu, 18 Oct 2018 19:54:26 +0200 Message-Id: <20181018175418.862296113@linuxfoundation.org> In-Reply-To: <20181018175416.718399607@linuxfoundation.org> References: <20181018175416.718399607@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Marek Lindner [ Upstream commit 4c4af6900844ab04c9434c972021d7b48610e06a ] The hardif_neigh refcounter is to be decreased by the queued work and currently is never decreased if the queue_work() call fails. Fix by checking the queue_work() return value and decrease refcount if necessary. Signed-off-by: Marek Lindner Signed-off-by: Sven Eckelmann Signed-off-by: Simon Wunderlich Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/batman-adv/bat_v_elp.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/net/batman-adv/bat_v_elp.c +++ b/net/batman-adv/bat_v_elp.c @@ -254,6 +254,7 @@ static void batadv_v_elp_periodic_work(s struct batadv_priv *bat_priv; struct sk_buff *skb; u32 elp_interval; + bool ret; bat_v = container_of(work, struct batadv_hard_iface_bat_v, elp_wq.work); hard_iface = container_of(bat_v, struct batadv_hard_iface, bat_v); @@ -315,8 +316,11 @@ static void batadv_v_elp_periodic_work(s * may sleep and that is not allowed in an rcu protected * context. Therefore schedule a task for that. */ - queue_work(batadv_event_workqueue, - &hardif_neigh->bat_v.metric_work); + ret = queue_work(batadv_event_workqueue, + &hardif_neigh->bat_v.metric_work); + + if (!ret) + batadv_hardif_neigh_put(hardif_neigh); } rcu_read_unlock();