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 <[email protected]> Cc: [email protected] --- 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); -- dm-devel mailing list [email protected] https://www.redhat.com/mailman/listinfo/dm-devel
