scsi: sd: sd_zbc: Verify that the zone size is a power of two

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.

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Damien Le Moal <[email protected]>
Reviewed-by: Himanshu Madhani <[email protected]>
Acked-by: Douglas Gilbert <[email protected]>
Signed-off-by: Bart Van Assche <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

1 files changed, 7 insertions, 0 deletions

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;