SPL_METHOD(SplFileInfo, getRealPath)
{
	spl_filesystem_object *intern = (spl_filesystem_object*)zend_object_store_get_object(getThis() TSRMLS_CC);
	char buff[MAXPATHLEN];
	char *filename;
	zend_error_handling error_handling;
	
	if (zend_parse_parameters_none() == FAILURE) {
		return;
	}

	zend_replace_error_handling(EH_THROW, spl_ce_RuntimeException, &error_handling TSRMLS_CC);

	if (intern->type == SPL_FS_DIR && !intern->file_name && intern->u.dir.entry.d_name[0]) {
		spl_filesystem_object_get_file_name(intern TSRMLS_CC);
	}
	
	if (intern->orig_path) {
		filename = intern->orig_path;
	} else { 
		filename = intern->file_name;
	}


	if (filename && VCWD_REALPATH(filename, buff)) {
#ifdef ZTS
		if (VCWD_ACCESS(buff, F_OK)) {
			RETVAL_FALSE;
		} else
#endif
		RETVAL_STRING(buff, 1);
	} else {
		RETVAL_FALSE;
	}

	zend_restore_error_handling(&error_handling TSRMLS_CC);
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.