 findoprnd(ITEM *ptr, int32 *pos)
 {
	/* since this function recurses, it could be driven to stack overflow. */
	check_stack_depth();

 	if (ptr[*pos].type == VAL || ptr[*pos].type == VALTRUE)
 	{
 		ptr[*pos].left = 0;
		(*pos)++;
	}
	else if (ptr[*pos].val == (int32) '!')
	{
		ptr[*pos].left = 1;
		(*pos)++;
		findoprnd(ptr, pos);
	}
	else
	{
		ITEM	   *curitem = &ptr[*pos];
		int32		tmp = *pos;

		(*pos)++;
		findoprnd(ptr, pos);
		curitem->left = *pos - tmp;
		findoprnd(ptr, pos);
	}
}

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