2 files changed, 4 insertions, 2 deletions
diff --git a/actionpack/lib/action_controller/metal/strong_parameters.rb b/actionpack/lib/action_controller/metal/strong_parameters.rb
index bd0bcd23ff..da640502a2 100644
--- a/actionpack/lib/action_controller/metal/strong_parameters.rb
+++ b/actionpack/lib/action_controller/metal/strong_parameters.rb
@@ -259,7 +259,9 @@ module ActionController
     #   params.slice(:a, :b) # => {"a"=>1, "b"=>2}
     #   params.slice(:d)     # => {}
     def slice(*keys)
-      self.class.new(super)
+      self.class.new(super).tap do |new_instance|
+        new_instance.instance_variable_set :@permitted, @permitted
+      end
     end
 
     # Returns an exact copy of the <tt>ActionController::Parameters</tt>
diff --git a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
index 0de10695e0..2b37a8d026 100644
--- a/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
+++ b/actionpack/lib/action_dispatch/middleware/show_exceptions.rb
@@ -28,7 +28,7 @@ module ActionDispatch
 
     def call(env)
       begin
-        response  = @app.call(env)
+        response = @app.call(env)
       rescue Exception => exception
         raise exception if env['action_dispatch.show_exceptions'] == false
       end