[SCSI] scsi_debug: fix false positive logical block reference tag check fail

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>
Reviewed-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 2decc6417518..bdfb9be1ec75 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);