static int write_part_number (char **ret_buffer, int *ret_buffer_len,
		int type, uint64_t value)
{
	char *packet_ptr;
	int packet_len;

	part_header_t pkg_head;
	uint64_t pkg_value;

	int offset;

	packet_len = sizeof (pkg_head) + sizeof (pkg_value);

	if (*ret_buffer_len < packet_len)
		return (-1);

	pkg_head.type = htons (type);
	pkg_head.length = htons (packet_len);
	pkg_value = htonll (value);

	packet_ptr = *ret_buffer;
	offset = 0;
	memcpy (packet_ptr + offset, &pkg_head, sizeof (pkg_head));
	offset += sizeof (pkg_head);
	memcpy (packet_ptr + offset, &pkg_value, sizeof (pkg_value));
	offset += sizeof (pkg_value);

	assert (offset == packet_len);

	*ret_buffer = packet_ptr + packet_len;
	*ret_buffer_len -= packet_len;

	return (0);
} /* int write_part_number */

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.