[PATCH v2 1/7] scsi_debug: fix false positive logical block reference tag check fail

Akinobu Mita
2014-01-19T13:51:56Z

Reading partially unwritten sectors generates a false positive logical
block reference tag check failure when DIF is enabled.

This bug is caused by missing ei_lba increment in loop of dif_verify()
when unwritten sector is skipped.

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Douglas Gilbert <dgilbert@interlog.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: James Bottomley <JBottomley@Parallels.com>
Cc: linux-scsi@vger.kernel.org
---
No change from previous version

drivers/scsi/scsi_debug.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 2decc64..bdfb9be 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -1832,7 +1832,7 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
struct sd_dif_tuple *sdt;
sector_t sector;

- for (i = 0; i < sectors; i++) {
+ for (i = 0; i < sectors; i++, ei_lba++) {
int ret;

sector = start_sec + i;
@@ -1846,8 +1846,6 @@ static int prot_verify_read(struct scsi_cmnd *SCpnt, sector_t start_sec,
dif_errors++;
return ret;
}
-
- ei_lba++;
}

dif_copy_prot(SCpnt, start_sec, sectors, true);
--
1.8.3.2