diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 2f74e17ad3e6e99760fff9a45ec6b4867da7594d..facee5f74fa46a3a570b534f98f85c34791926dd 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -391,10 +391,19 @@ iblock_execute_unmap(struct se_cmd *cmd)
 	sense_reason_t ret = 0;
 	int dl, bd_dl, err;
 
+	/* We never set ANC_SUP */
+	if (cmd->t_task_cdb[1])
+		return TCM_INVALID_CDB_FIELD;
+
+	if (cmd->data_length == 0) {
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
+		return 0;
+	}
+
 	if (cmd->data_length < 8) {
 		pr_warn("UNMAP parameter list length %u too small\n",
 			cmd->data_length);
-		return TCM_INVALID_PARAMETER_LIST;
+		return TCM_PARAMETER_LIST_LENGTH_ERROR;
 	}
 
 	buf = transport_kmap_data_sg(cmd);
diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 96b64d57ebbb9f0180ace4f2dc0b3e6f5dd1e3b8..2030b608136d3cfb7dc4509105ff061a3a621e14 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1517,6 +1517,7 @@ void transport_generic_request_failure(struct se_cmd *cmd,
 	case TCM_UNSUPPORTED_SCSI_OPCODE:
 	case TCM_INVALID_CDB_FIELD:
 	case TCM_INVALID_PARAMETER_LIST:
+	case TCM_PARAMETER_LIST_LENGTH_ERROR:
 	case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE:
 	case TCM_UNKNOWN_MODE_PAGE:
 	case TCM_WRITE_PROTECTED:
@@ -2677,6 +2678,15 @@ transport_send_check_condition_and_sense(struct se_cmd *cmd,
 		/* INVALID FIELD IN PARAMETER LIST */
 		buffer[SPC_ASC_KEY_OFFSET] = 0x26;
 		break;
+	case TCM_PARAMETER_LIST_LENGTH_ERROR:
+		/* CURRENT ERROR */
+		buffer[0] = 0x70;
+		buffer[SPC_ADD_SENSE_LEN_OFFSET] = 10;
+		/* ILLEGAL REQUEST */
+		buffer[SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST;
+		/* PARAMETER LIST LENGTH ERROR */
+		buffer[SPC_ASC_KEY_OFFSET] = 0x1a;
+		break;
 	case TCM_UNEXPECTED_UNSOLICITED_DATA:
 		/* CURRENT ERROR */
 		buffer[0] = 0x70;
diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index df14dce59191df42e1270918cb143ebaf02dddc9..c4af592f7057e472d8953099c56651423d0ec6ad 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -195,6 +195,7 @@ enum tcm_sense_reason_table {
 	TCM_RESERVATION_CONFLICT		= R(0x10),
 	TCM_ADDRESS_OUT_OF_RANGE		= R(0x11),
 	TCM_OUT_OF_RESOURCES			= R(0x12),
+	TCM_PARAMETER_LIST_LENGTH_ERROR		= R(0x13),
 #undef R
 };