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dm-verity: fix prefetch-vs-suspend race

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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 <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Mikulas Patocka 2025-03-28 16:17:45 +01:00
parent 8bde1033f9
commit 2de510fccb
1 changed files with 8 additions and 0 deletions
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8
drivers/md/dm-verity-target.c
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@ -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,