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authorAlexey Khoroshilov <khoroshilov@ispras.ru>2014-05-07 01:26:04 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-05-27 14:08:46 -0700
commita0f104644ec27ce5bbb36e950eb426dba9a3ad44 (patch)
tree1b6a9e19b07eda7cf09408403cb84822c58436da
parent8a0427d192e6043834414210dd14cc1289daff18 (diff)
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 <khoroshilov@ispras.ru> Acked-by: David Fries <david@fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: stable <stable@vger.kernel.org> # 3.15 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/w1/w1.c2
-rw-r--r--drivers/w1/w1_int.c4
2 files changed, 6 insertions, 0 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index ff52618..5d73415 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 9b084db..728039d2 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;