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dm delay: fix a crash when invalid device is specified 

commit 81bc6d150a 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>
This commit is contained in:
Mikulas Patocka 2019-04-25 12:07:54 -04:00 committed by Greg Kroah-Hartman
parent fc6d84abd8
commit 9da66c87fd
1 changed files with 2 additions and 1 deletions
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3
drivers/md/dm-delay.c
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@ -222,7 +222,8 @@ static void delay_dtr(struct dm_target *ti)
{
struct delay_c *dc = ti->private;
destroy_workqueue(dc->kdelayd_wq);
if (dc->kdelayd_wq)
destroy_workqueue(dc->kdelayd_wq);
dm_put_device(ti, dc->dev_read);