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authorDamien Le Moal <damien.lemoal@wdc.com>2019-07-10 13:53:10 +0900
committerJens Axboe <axboe@kernel.dk>2019-07-10 09:00:57 -0600
commit113ab72ed4794c193509a97d7c6d32a6886e1682 (patch)
tree63e80e76c922ae4626bfe1721bb319254a25e985 /Documentation
parentd3f77dfdc71835f8db71ca57d272b1fbec9dfc18 (diff)
block: Fix potential overflow in blk_report_zones()
For large values of the number of zones reported and/or large zone sizes, the sector increment calculated with blk_queue_zone_sectors(q) * n in blk_report_zones() loop can overflow the unsigned int type used for the calculation as both "n" and blk_queue_zone_sectors() value are unsigned int. E.g. for a device with 256 MB zones (524288 sectors), overflow happens with 8192 or more zones reported. Changing the return type of blk_queue_zone_sectors() to sector_t, fixes this problem and avoids overflow problem for all other callers of this helper too. The same change is also applied to the bdev_zone_sectors() helper. Fixes: e76239a3748c ("block: add a report_zones method") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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