Commit 2de510fc authored by Mikulas Patocka's avatar Mikulas Patocka
Browse files

dm-verity: fix prefetch-vs-suspend race 



There's a possible race condition in dm-verity - the prefetch work item
may race with suspend and it is possible that prefetch continues to run
while the device is suspended. Fix this by calling flush_workqueue and
dm_bufio_client_reset in the postsuspend hook.

Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
parent 8bde1033

drivers/md/dm-verity-target.c

+8 −0
Original line number Diff line number Diff line
@@ -836,6 +836,13 @@ static int verity_map(struct dm_target *ti, struct bio *bio) 
	return DM_MAPIO_SUBMITTED;

}



static void verity_postsuspend(struct dm_target *ti)

{

	struct dm_verity *v = ti->private;

	flush_workqueue(v->verify_wq);

	dm_bufio_client_reset(v->bufio);

}



/*

 * Status: V (valid) or C (corruption found)

 */
@@ -1806,6 +1813,7 @@ static struct target_type verity_target = { 
	.ctr		= verity_ctr,

	.dtr		= verity_dtr,

	.map		= verity_map,

	.postsuspend	= verity_postsuspend,

	.status		= verity_status,

	.prepare_ioctl	= verity_prepare_ioctl,

	.iterate_devices = verity_iterate_devices,