[PATCH 5.14 102/162] scsi: sd_zbc: Support disks with more than 2**32 logical blocks

[Greg Kroah-Hartman]

From: Bart Van Assche <bvanassche@xxxxxxx>

[ Upstream commit 1d479e6c9cb2b40abfb455863a4e9335db882e33 ]

This patch addresses the following Coverity report about the zno *
sdkp->zone_blocks expression:

CID 1475514 (#1 of 1): Unintentional integer overflow (OVERFLOW_BEFORE_WIDEN)
overflow_before_widen: Potentially overflowing expression zno *
sdkp->zone_blocks with type unsigned int (32 bits, unsigned) is evaluated
using 32-bit arithmetic, and then used in a context that expects an
expression of type sector_t (64 bits, unsigned).

Link: https://lore.kernel.org/r/20210917212314.2362324-1-bvanassche@xxxxxxx
Fixes: 5795eb443060 ("scsi: sd_zbc: emulate ZONE_APPEND commands")
Cc: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Cc: Damien Le Moal <Damien.LeMoal@xxxxxxx>
Cc: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@xxxxxxx>
Reviewed-by: Himanshu Madhani <himanshu.madhani@xxxxxxxxxx>
Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/scsi/sd_zbc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/sd_zbc.c b/drivers/scsi/sd_zbc.c
index ea8b3f6ee5cd..06ee1f045e97 100644
--- a/drivers/scsi/sd_zbc.c
+++ b/drivers/scsi/sd_zbc.c
@@ -280,7 +280,7 @@ static void sd_zbc_update_wp_offset_workfn(struct work_struct *work)
 {
 	struct scsi_disk *sdkp;
 	unsigned long flags;
-	unsigned int zno;
+	sector_t zno;
 	int ret;
 
 	sdkp = container_of(work, struct scsi_disk, zone_wp_offset_work);
-- 
2.33.0