static int sr_read_sector(Scsi_CD *cd, int lba, int blksize, unsigned char *dest)
{
	struct packet_command cgc;
	int rc;

	/* we try the READ CD command first... */
	if (cd->readcd_known) {
		rc = sr_read_cd(cd, dest, lba, 0, blksize);
		if (-EDRIVE_CANT_DO_THIS != rc)
			return rc;
		cd->readcd_known = 0;
		sr_printk(KERN_INFO, cd,
			  "CDROM does'nt support READ CD (0xbe) command\n");
		/* fall & retry the other way */
	}
	/* ... if this fails, we switch the blocksize using MODE SELECT */
	if (blksize != cd->device->sector_size) {
		if (0 != (rc = sr_set_blocklength(cd, blksize)))
			return rc;
	}
#ifdef DEBUG
	sr_printk(KERN_INFO, cd, "sr_read_sector lba=%d blksize=%d\n",
		  lba, blksize);
#endif

	memset(&cgc, 0, sizeof(struct packet_command));
	cgc.cmd[0] = GPCMD_READ_10;
	cgc.cmd[2] = (unsigned char) (lba >> 24) & 0xff;
	cgc.cmd[3] = (unsigned char) (lba >> 16) & 0xff;
	cgc.cmd[4] = (unsigned char) (lba >> 8) & 0xff;
	cgc.cmd[5] = (unsigned char) lba & 0xff;
	cgc.cmd[8] = 1;
	cgc.buffer = dest;
	cgc.buflen = blksize;
	cgc.data_direction = DMA_FROM_DEVICE;
	cgc.timeout = IOCTL_TIMEOUT;
	rc = sr_do_ioctl(cd, &cgc);

	return rc;
}

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.