int sr_drive_status(struct cdrom_device_info *cdi, int slot)
{
	struct scsi_cd *cd = cdi->handle;
	struct scsi_sense_hdr sshdr;
	struct media_event_desc med;

	if (CDSL_CURRENT != slot) {
		/* we have no changer support */
		return -EINVAL;
	}
	if (!scsi_test_unit_ready(cd->device, SR_TIMEOUT, MAX_RETRIES, &sshdr))
		return CDS_DISC_OK;

	/* SK/ASC/ASCQ of 2/4/1 means "unit is becoming ready" */
	if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
			&& sshdr.asc == 0x04 && sshdr.ascq == 0x01)
		return CDS_DRIVE_NOT_READY;

	if (!cdrom_get_media_event(cdi, &med)) {
		if (med.media_present)
			return CDS_DISC_OK;
		else if (med.door_open)
			return CDS_TRAY_OPEN;
		else
			return CDS_NO_DISC;
	}

	/*
	 * SK/ASC/ASCQ of 2/4/2 means "initialization required"
	 * Using CD_TRAY_OPEN results in an START_STOP_UNIT to close
	 * the tray, which resolves the initialization requirement.
	 */
	if (scsi_sense_valid(&sshdr) && sshdr.sense_key == NOT_READY
			&& sshdr.asc == 0x04 && sshdr.ascq == 0x02)
		return CDS_TRAY_OPEN;

	/*
	 * 0x04 is format in progress .. but there must be a disc present!
	 */
	if (sshdr.sense_key == NOT_READY && sshdr.asc == 0x04)
		return CDS_DISC_OK;

	/*
	 * If not using Mt Fuji extended media tray reports,
	 * just return TRAY_OPEN since ATAPI doesn't provide
	 * any other way to detect this...
	 */
	if (scsi_sense_valid(&sshdr) &&
	    /* 0x3a is medium not present */
	    sshdr.asc == 0x3a)
		return CDS_NO_DISC;
	else
		return CDS_TRAY_OPEN;

	return CDS_DRIVE_NOT_READY;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.