static int sr_read_tocentry(struct cdrom_device_info *cdi,
		struct cdrom_tocentry *tocentry)
{
	struct scsi_cd *cd = cdi->handle;
	struct packet_command cgc;
	int result;
	unsigned char *buffer;

	buffer = kmalloc(32, GFP_KERNEL | SR_GFP_DMA(cd));
	if (!buffer)
		return -ENOMEM;

	memset(&cgc, 0, sizeof(struct packet_command));
	cgc.timeout = IOCTL_TIMEOUT;
	cgc.cmd[0] = GPCMD_READ_TOC_PMA_ATIP;
	cgc.cmd[1] |= (tocentry->cdte_format == CDROM_MSF) ? 0x02 : 0;
	cgc.cmd[6] = tocentry->cdte_track;
	cgc.cmd[8] = 12;		/* LSB of length */
	cgc.buffer = buffer;
	cgc.buflen = 12;
	cgc.data_direction = DMA_FROM_DEVICE;

	result = sr_do_ioctl(cd, &cgc);

	tocentry->cdte_ctrl = buffer[5] & 0xf;
	tocentry->cdte_adr = buffer[5] >> 4;
	tocentry->cdte_datamode = (tocentry->cdte_ctrl & 0x04) ? 1 : 0;
	if (tocentry->cdte_format == CDROM_MSF) {
		tocentry->cdte_addr.msf.minute = buffer[9];
		tocentry->cdte_addr.msf.second = buffer[10];
		tocentry->cdte_addr.msf.frame = buffer[11];
	} else
		tocentry->cdte_addr.lba = (((((buffer[8] << 8) + buffer[9]) << 8)
			+ buffer[10]) << 8) + buffer[11];

	kfree(buffer);
	return result;
}

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.