From: Roman Bolshakov <r.bolshakov@yadro.com>
Date: Tue, 2 Jul 2019 22:16:38 +0300
Subject: scsi: target/iblock: Fix overrun in WRITE SAME emulation [Modified]
Patch-mainline: v5.2
Git-commit: 5676234f20fef02f6ca9bd66c63a8860fce62645
References: bsc#1140424

WRITE SAME corrupts data on the block device behind iblock if the command
is emulated. The emulation code issues (M - 1) * N times more bios than
requested, where M is the number of 512 blocks per real block size and N is
the NUMBER OF LOGICAL BLOCKS specified in WRITE SAME command. So, for a
device with 4k blocks, 7 * N more LBAs gets written after the requested
range.

The issue happens because the number of 512 byte sectors to be written is
decreased one by one while the real bios are typically from 1 to 8 512 byte
sectors per bio.

[Note: modified to match our sources, but no change in functionality. -- lduncan]

Fixes: c66ac9db8d4a ("[SCSI] target: Add LIO target core v4.0.0-rc6")
Cc: <stable@vger.kernel.org>
Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Lee Duncan <lduncan@suse.com>
---
 drivers/target/target_core_iblock.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -517,7 +517,7 @@ iblock_execute_write_same(struct se_cmd
 
 		/* Always in 512 byte units for Linux/Block */
 		block_lba += sg->length >> IBLOCK_LBA_SHIFT;
-		sectors -= 1;
+		sectors -= sg->length >> IBLOCK_LBA_SHIFT;
 	}
 
 	iblock_submit_bios(&list);