From 2de510fccbca3d1906b55f4be5f1de83fa2424ef Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 28 Mar 2025 16:17:45 +0100 Subject: [PATCH] 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: Mikulas Patocka Cc: stable@vger.kernel.org --- drivers/md/dm-verity-target.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c index 40448a8c74b1..3c427f18a04b 100644 --- a/drivers/md/dm-verity-target.c +++ b/drivers/md/dm-verity-target.c @@ -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, -- 2.50.1