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dm zoned: fix overflow when converting zone ID to sectors 

A zone ID is a 32 bits unsigned int which can overflow when doing the
bit shifts in dmz_start_sect().  With a 256 MB zone size drive, the
overflow happens for a zone ID >= 8192.

Fix this by casting the zone ID to a sector_t before doing the bit
shift.  While at it, similarly fix dmz_start_block().

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Damien Le Moal 2017-07-03 15:44:58 +09:00 committed by Mike Snitzer
parent 4d49f1b4a1
commit 3908c9839b
1 changed files with 2 additions and 2 deletions
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4
drivers/md/dm-zoned-metadata.c
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@ -191,12 +191,12 @@ unsigned int dmz_id(struct dmz_metadata *zmd, struct dm_zone *zone)
sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone) sector_t dmz_start_sect(struct dmz_metadata *zmd, struct dm_zone *zone)
{ {
return dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift; return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_sectors_shift;
} }
sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone) sector_t dmz_start_block(struct dmz_metadata *zmd, struct dm_zone *zone)
{ {
return dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift; return (sector_t)dmz_id(zmd, zone) << zmd->dev->zone_nr_blocks_shift;
} }
unsigned int dmz_nr_chunks(struct dmz_metadata *zmd) unsigned int dmz_nr_chunks(struct dmz_metadata *zmd)