[PATCH v2 2/9] scsi: sd_zbc: Verify that the zone size is a power of two

Bart Van Assche
2022-04-21T18:30:49Z

The following check in sd_zbc_cmnd_checks() can only work correctly if
the zone size is a power of two:

if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
/* Unaligned request */
return BLK_STS_IOERR;

Hence this patch that verifies that the zone size is a power of two.

Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/sd_zbc.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index 2ae44bc52a5f..9ef5ad345185 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -664,6 +664,13 @@ static int sd_zbc_check_capacity(struct scsi_disk *sdkp, unsigned char *buf,
return -EFBIG;
}

+ if (!is_power_of_2(zone_blocks)) {
+ sd_printk(KERN_ERR, sdkp,
+ "Zone size %llu is not a power of two.\n",
+ zone_blocks);
+ return -EINVAL;
+ }
+
*zblocks = zone_blocks;

return 0;