[PATCH 1/4] scsi: target: Fix WRITE_SAME NDOB size check

[Mike Christie <michael.christie@oracle.com>]

If the WRITE_SAME NDOB bit is set then there is not going to be a
buffer. LIO core will then complain:

TARGET_CORE[iSCSI]: Expected Transfer Length: 0 does not match SCSI CDB
Length: 512 for SAM Opcode: 0x93

This fixes the issue by detecting when the bit is set and adjusting the
size.

Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
 drivers/target/target_core_sbc.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index ca1b2312d6e7..6d98b016a942 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -976,7 +976,11 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 				return TCM_INVALID_CDB_FIELD;
 			}
 
-			size = sbc_get_size(cmd, 1);
+			/* If NDOB is set there will not be a Data-Out buffer */
+			if (cdb[1] & 0x01)
+				size = 0;
+			else
+				size = sbc_get_size(cmd, 1);
 			cmd->t_task_lba = get_unaligned_be64(&cdb[12]);
 
 			ret = sbc_setup_write_same(cmd, cdb[10], ops);
@@ -1075,7 +1079,11 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 			return TCM_INVALID_CDB_FIELD;
 		}
 
-		size = sbc_get_size(cmd, 1);
+		/* If NDOB is set there will not be a Data-Out buffer */
+		if (cdb[1] & 0x01)
+			size = 0;
+		else
+			size = sbc_get_size(cmd, 1);
 		cmd->t_task_lba = get_unaligned_be64(&cdb[2]);
 
 		ret = sbc_setup_write_same(cmd, cdb[1], ops);
-- 
2.25.1