When the target line contains 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@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
---
drivers/md/dm-delay.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
Index: linux-2.6/drivers/md/dm-delay.c
===================================================================
--- linux-2.6.orig/drivers/md/dm-delay.c 2019-01-12 16:48:32.000000000 +0100
+++ linux-2.6/drivers/md/dm-delay.c 2019-04-25 18:01:08.000000000 +0200
@@ -121,7 +121,8 @@ static void delay_dtr(struct dm_target *
{
struct delay_c *dc = ti->private;
- destroy_workqueue(dc->kdelayd_wq);
+ if (dc->kdelayd_wq)
+ destroy_workqueue(dc->kdelayd_wq);
if (dc->read.dev)
dm_put_device(ti, dc->read.dev);
--
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