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| author |  Damien Le Moal <damien.lemoal@wdc.com>
| 2017-07-03 15:44:58 +0900 |
|---|---|---|
| committer |  Mike Snitzer <snitzer@redhat.com>
| 2017-07-05 16:08:47 -0400 |
| commit | 3908c9839b1077e677ef9e92d2bce7f224519c59 (patch) | |
| tree | 4b385dcc6742ce62ba9aeb1bed662cda3993df91 /drivers/md | |
| parent | dm raid: stop using BUG() in __rdev_sectors() (diff) | |
| download | linux-3908c9839b1077e677ef9e92d2bce7f224519c59.tar.gz linux-3908c9839b1077e677ef9e92d2bce7f224519c59.tar.bz2 linux-3908c9839b1077e677ef9e92d2bce7f224519c59.zip | |
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>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/dm-zoned-metadata.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/dm-zoned-metadata.c b/drivers/md/dm-zoned-metadata.c index 4618441cc412..884ff7c170a0 100644 --- a/drivers/md/dm-zoned-metadata.c +++ b/drivers/md/dm-zoned-metadata.c @@ -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) { - 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) { - 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) |