From a0f104644ec27ce5bbb36e950eb426dba9a3ad44 Mon Sep 17 00:00:00 2001 From: Alexey Khoroshilov Date: Wed, 7 May 2014 01:26:04 +0400 Subject: [PATCH] w1: do not unlock unheld list_mutex in __w1_remove_master_device() 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 Cc: stable # 3.15 Signed-off-by: Greg Kroah-Hartman --- drivers/w1/w1.c | 2 ++ drivers/w1/w1_int.c | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index ff52618cafbe..5d7341520544 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -1078,6 +1078,8 @@ static void w1_search_process(struct w1_master *dev, u8 search_type) * 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) diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 9b084db739c7..728039d2efe1 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -219,9 +219,13 @@ void __w1_remove_master_device(struct w1_master *dev) 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; -- GitLab