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From: Bart Van Assche <bvanassche@acm.org>
To: "Martin K . Petersen" <martin.petersen@oracle.com>
Cc: linux-scsi@vger.kernel.org, Bart Van Assche <bvanassche@acm.org>,
	Johannes Thumshirn <johannes.thumshirn@wdc.com>,
	Damien Le Moal <Damien.LeMoal@wdc.com>,
	Hannes Reinecke <hare@suse.de>
Subject: [PATCH] scsi: sd_zbc: Support disks with more than 2**32 logical blocks
Date: Fri, 17 Sep 2021 14:23:14 -0700	[thread overview]
Message-ID: <20210917212314.2362324-1-bvanassche@acm.org> (raw)

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).

Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Damien Le Moal <Damien.LeMoal@wdc.com>
Cc: Hannes Reinecke <hare@suse.de>
Fixes: 5795eb443060 ("scsi: sd_zbc: emulate ZONE_APPEND commands")
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
 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 b9757f24b0d6..ded4d7a070a0 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);

             reply	other threads:[~2021-09-17 21:23 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-17 21:23 Bart Van Assche [this message]
2021-09-18  7:12 ` [PATCH] scsi: sd_zbc: Support disks with more than 2**32 logical blocks Damien Le Moal
2021-09-19  8:14 ` Hannes Reinecke
2021-09-20  7:22 ` Johannes Thumshirn
2021-09-20 14:04 ` Himanshu Madhani
2021-09-22  4:44 ` Martin K. Petersen

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