Commit 1f4195f9 authored Apr 25, 2019 by Mikulas Patocka Committed by Greg Kroah-Hartman May 25, 2019

dm delay: fix a crash when invalid device is specified



commit 81bc6d150ace6250503b825d9d0c10f7bbd24095 upstream.

When the target line contains an invalid device, delay_ctr() will call
delay_dtr() with NULL workqueue.  Attempting to destroy the NULL
workqueue causes a crash.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent d0a3f25d

drivers/md/dm-delay.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -222,6 +222,7 @@ static void delay_dtr(struct dm_target *ti)
		{
		struct delay_c *dc = ti->private;

		if (dc->kdelayd_wq)
		destroy_workqueue(dc->kdelayd_wq);

		dm_put_device(ti, dc->dev_read);