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block: avoid possible overflow for chunk_sectors check in blk_stack_limits()

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[ Upstream commit 448dfecc7f ]

In blk_stack_limits(), we check that the t->chunk_sectors value is a
multiple of the t->physical_block_size value.

However, by finding the chunk_sectors value in bytes, we may overflow
the unsigned int which holds chunk_sectors, so change the check to be
based on sectors.

Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20250729091448.1691334-2-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
John Garry 2025-07-29 09:14:47 +00:00 committed by Greg Kroah-Hartman
parent 53acbc9434
commit 8b3ce085b5
1 changed files with 1 additions and 1 deletions
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2
block/blk-settings.c
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@ -596,7 +596,7 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
}
/* chunk_sectors a multiple of the physical block size? */
if ((t->chunk_sectors << 9) & (t->physical_block_size - 1)) {
if (t->chunk_sectors % (t->physical_block_size >> SECTOR_SHIFT)) {
t->chunk_sectors = 0;
t->misaligned = 1;
ret = -1;