TYPO3 Core

I just managed to make TYPO3 scan my complete file system for icons to include into a select field. -.-

Situation:

 'field' => [
            'config' => [
                'type' => 'select',
                'renderType' => 'selectSingle',
                'maxitems' => 1,
                'items' => [
                    ['', 0],
                ],
                'fileFolder' => 'EXT:my_ext/Resources/Public/Icons/',
                'fileFolder_extList' => 'svg',
                'fileFolder_recursions' => 0,
            ],
        ],

Resulting in the exception: #1476107295: PHP Warning: scandir(/boot/efi): failed to open dir: Permission denied in ....

In fact, nothing bad happened, thanks to the permission violation, but still this is not really helpful to find the source of the error.

The problem is a missing check in sysext/backend/Classes/Form/FormDataProvider/AbstractItemProvider.php line 372, where a / is addad after an rtrim on the filepath, might it be empty or not.