static int pmcraid_build_ioadl(
	struct pmcraid_instance *pinstance,
	struct pmcraid_cmd *cmd
)
{
	int i, nseg;
	struct scatterlist *sglist;

	struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
	struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
	struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;

	u32 length = scsi_bufflen(scsi_cmd);

	if (!length)
		return 0;

	nseg = scsi_dma_map(scsi_cmd);

	if (nseg < 0) {
		scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
		return -1;
	} else if (nseg > PMCRAID_MAX_IOADLS) {
		scsi_dma_unmap(scsi_cmd);
		scmd_printk(KERN_ERR, scsi_cmd,
			"sg count is (%d) more than allowed!\n", nseg);
		return -1;
	}

	/* Initialize IOARCB data transfer length fields */
	if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
		ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;

	ioarcb->request_flags0 |= NO_LINK_DESCS;
	ioarcb->data_transfer_length = cpu_to_le32(length);
	ioadl = pmcraid_init_ioadls(cmd, nseg);

	/* Initialize IOADL descriptor addresses */
	scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
		ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
		ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
		ioadl[i].flags = 0;
	}
	/* setup last descriptor */
	ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;

	return 0;
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.