static int cdrom_read_cdda_old(struct cdrom_device_info *cdi, __u8 __user *ubuf,
			       int lba, int nframes)
{
	struct packet_command cgc;
	int ret = 0;
	int nr;

	cdi->last_sense = 0;

	memset(&cgc, 0, sizeof(cgc));

	/*
	 * start with will ra.nframes size, back down if alloc fails
	 */
	nr = nframes;
	do {
		cgc.buffer = kmalloc(CD_FRAMESIZE_RAW * nr, GFP_KERNEL);
		if (cgc.buffer)
			break;

		nr >>= 1;
	} while (nr);

	if (!nr)
		return -ENOMEM;

	cgc.data_direction = CGC_DATA_READ;
	while (nframes > 0) {
		if (nr > nframes)
			nr = nframes;

		ret = cdrom_read_block(cdi, &cgc, lba, nr, 1, CD_FRAMESIZE_RAW);
		if (ret)
			break;
		if (copy_to_user(ubuf, cgc.buffer, CD_FRAMESIZE_RAW * nr)) {
			ret = -EFAULT;
			break;
		}
		ubuf += CD_FRAMESIZE_RAW * nr;
		nframes -= nr;
		lba += nr;
	}
	kfree(cgc.buffer);
	return ret;
}

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.