From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexey Khoroshilov , David Fries , Evgeniy Polyakov Subject: [PATCH 3.15 007/139] w1: do not unlock unheld list_mutex in __w1_remove_master_device() Date: Sat, 28 Jun 2014 10:46:08 -0700 Message-Id: <20140628174605.699151559@linuxfoundation.org> In-Reply-To: <20140628174605.352098823@linuxfoundation.org> References: <20140628174605.352098823@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexey Khoroshilov commit a0f104644ec27ce5bbb36e950eb426dba9a3ad44 upstream. w1_process_callbacks() expects to be called with dev->list_mutex held, but it is the fact only in w1_process(). __w1_remove_master_device() calls w1_process_callbacks() after it releases list_mutex. The patch fixes __w1_remove_master_device() to acquire list_mutex for w1_process_callbacks(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov Acked-by: David Fries Acked-by: Evgeniy Polyakov Signed-off-by: Greg Kroah-Hartman --- drivers/w1/w1.c | 2 ++ drivers/w1/w1_int.c | 4 ++++ 2 files changed, 6 insertions(+) --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -1078,6 +1078,8 @@ static void w1_search_process(struct w1_ * w1_process_callbacks() - execute each dev->async_list callback entry * @dev: w1_master device * + * The w1 master list_mutex must be held. + * * Return: 1 if there were commands to executed 0 otherwise */ int w1_process_callbacks(struct w1_master *dev) --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -219,9 +219,13 @@ void __w1_remove_master_device(struct w1 if (msleep_interruptible(1000)) flush_signals(current); + mutex_lock(&dev->list_mutex); w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); } + mutex_lock(&dev->list_mutex); w1_process_callbacks(dev); + mutex_unlock(&dev->list_mutex); memset(&msg, 0, sizeof(msg)); msg.id.mst.id = dev->id;