cntsize(QTNode *in, int *sumlen, int *nnode)
{
	/* since this function recurses, it could be driven to stack overflow. */
	check_stack_depth();

	*nnode += 1;
	if (in->valnode->type == QI_OPR)
	{
		int			i;

		for (i = 0; i < in->nchild; i++)
			cntsize(in->child[i], sumlen, nnode);
	}
	else
	{
		*sumlen += in->valnode->qoperand.length + 1;
	}
}

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