Infinite Loop created when $target_parent is outside of base_dir

[kanyuga]

We had a client who was moving from wordpress to plesk. As such his root directory changed from /home/foo/public_html/ to /var/www/vhosts/bar/. He had set his upload path to /home/foo/public_html/wp-content causing the server to throw a warning on line 1497 of wp-includes/functions.php below resulting in an infinite loop that throws up errors.

We are using PHP 5.5.9.

// We need to find the permissions of the parent folder that exists and inherit that.
$target_parent = dirname( $target );
while ( '.' != $target_parent && ! is_dir( $target_parent ) ) {
    $target_parent = dirname( $target_parent );
}

[SergeyBiryukov]

Introduced in [25047].

[JxsDotNL]

Duplicate of #30258.