core-bundle/src/Resources/contao/library/Contao/Files.php
protected function validate()
	{
		foreach (\func_get_args() as $strPath)
		{
			if ($strPath == '') // see #5795
			{
				throw new \RuntimeException('No file or folder name given');
			}
			elseif (Validator::isInsecurePath($strPath))
			{
				throw new \RuntimeException('Invalid file or folder name ' . $strPath);
			}
		}
	}
protected function validate()
	{
		foreach (\func_get_args() as $strPath)
		{
			if ($strPath == '') // see #5795
			{
				throw new \RuntimeException('No file or folder name given');
			}
			elseif (Validator::isInsecurePath($strPath))
			{
				throw new \RuntimeException('Invalid file or folder name ' . $strPath);
			}
		}
	}
Validate a path

@throws \RuntimeException If the given paths are not valid