box_poly(PG_FUNCTION_ARGS)
{
	BOX		   *box = PG_GETARG_BOX_P(0);
	POLYGON    *poly;
	int			size;

	/* map four corners of the box to a polygon */
	size = offsetof(POLYGON, p[0]) +sizeof(poly->p[0]) * 4;
	poly = (POLYGON *) palloc(size);

	SET_VARSIZE(poly, size);
	poly->npts = 4;

	poly->p[0].x = box->low.x;
	poly->p[0].y = box->low.y;
	poly->p[1].x = box->low.x;
	poly->p[1].y = box->high.y;
	poly->p[2].x = box->high.x;
	poly->p[2].y = box->high.y;
	poly->p[3].x = box->high.x;
	poly->p[3].y = box->low.y;

	box_fill(&poly->boundbox, box->high.x, box->low.x,
			 box->high.y, box->low.y);

	PG_RETURN_POLYGON_P(poly);
}

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