Merge pull request #6125 from neTp9c/issue/6107

[Fixes #6107] Fixing content permissions part

src/Orchard.Web/Modules/Orchard.ContentPermissions/Drivers/ContentPermissionsPartDriver.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Xml;
@@ -120,6 +120,11 @@ namespace Orchard.ContentPermissions.Drivers {
 
         protected override DriverResult Editor(ContentPermissionsPart part, IUpdateModel updater, dynamic shapeHelper) {
 
+            // ensure the current user is allowed to define permissions
+            if (!_authorizer.Authorize(Permissions.GrantPermission)) {
+                return null;
+            }
+
             var allRoles = _roleService.GetRoles().Select(x => x.Name).OrderBy(x => x).ToList();
 
             var model = new ContentPermissionsPartViewModel();
@@ -224,4 +229,4 @@ namespace Orchard.ContentPermissions.Drivers {
             }
         }
     }
-}
+}