Trouble with RLS and a custom authorize function

CREATE OR REPLACE FUNCTION authorize(requested_permission app_permission, profile_id uuid, project_id uuid) RETURNS boolean AS $$
DECLARE
    bind_permissions int;
BEGIN
    SELECT count(*)
        FROM public.role_permissions as p
        INNER JOIN public.projects_users as pu on p.role = pu.role
    WHERE p.permission = authorize.requested_permission
        AND pu.profile_id = authorize.profile_id
        AND pu.project_id = authorize.project_id
    INTO bind_permissions;
    RETURN bind_permissions > 0;
END;
$$ LANGUAGE plpgsql SECURITY DEFINER;