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dm: lock limits when reading them

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commit abb4cf2f4c1c1b637cad04d726f2e13fd3051e03 upstream.

Lock queue limits when reading them, so that we don't read halfway
modified values.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mikulas Patocka
2025-04-22 21:17:36 +02:00
committed by Greg Kroah-Hartman
parent 8e89c17dc8
commit f2986bccf2
1 changed files with 7 additions and 1 deletions
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8
drivers/md/dm-table.c
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@@ -431,6 +431,7 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
return 0;
}
mutex_lock(&q->limits_lock);
if (blk_stack_limits(limits, &q->limits,
get_start_sect(bdev) + start) < 0)
DMWARN("%s: adding target device %pg caused an alignment inconsistency: "
@@ -448,6 +449,7 @@ static int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
*/
if (!dm_target_has_integrity(ti->type))
queue_limits_stack_integrity_bdev(limits, bdev);
mutex_unlock(&q->limits_lock);
return 0;
}
@@ -1734,8 +1736,12 @@ static int device_not_write_zeroes_capable(struct dm_target *ti, struct dm_dev *
sector_t start, sector_t len, void *data)
{
struct request_queue *q = bdev_get_queue(dev->bdev);
int b;
return !q->limits.max_write_zeroes_sectors;
mutex_lock(&q->limits_lock);
b = !q->limits.max_write_zeroes_sectors;
mutex_unlock(&q->limits_lock);
return b;
}
static bool dm_table_supports_write_zeroes(struct dm_table *t)