1 files changed, 25 insertions, 3 deletions
diff --git a/actionpack/lib/abstract_controller/base.rb b/actionpack/lib/abstract_controller/base.rb
index fd6a46fbec..2541125ec6 100644
--- a/actionpack/lib/abstract_controller/base.rb
+++ b/actionpack/lib/abstract_controller/base.rb
@@ -112,7 +112,7 @@ module AbstractController
     def process(action, *args)
       @_action_name = action_name = action.to_s
 
-      unless action_name = method_for_action(action_name)
+      unless action_name = _find_action_name(action_name)
         raise ActionNotFound, "The action '#{action}' could not be found for #{self.class.name}"
       end
 
@@ -138,7 +138,7 @@ module AbstractController
     # available action consider actions that are also available
     # through other means, for example, implicit render ones.
     def available_action?(action_name)
-      method_for_action(action_name).present?
+      _find_action_name(action_name).present?
     end
 
     private
@@ -182,6 +182,23 @@ module AbstractController
       end
 
       # Takes an action name and returns the name of the method that will
+      # handle the action.
+      #
+      # It checks if the action name is valid and returns false otherwise.
+      #
+      # See method_for_action for more information.
+      #
+      # ==== Parameters
+      # * <tt>action_name</tt> - An action name to find a method name for
+      #
+      # ==== Returns
+      # * <tt>string</tt> - The name of the method that handles the action
+      # * false           - No valid method name could be found. Raise ActionNotFound.
+      def _find_action_name(action_name)
+        _valid_action_name?(action_name) && method_for_action(action_name)
+      end
+
+      # Takes an action name and returns the name of the method that will
       # handle the action. In normal cases, this method returns the same
       # name as it receives. By default, if #method_for_action receives
       # a name that is not an action, it will look for an #action_missing
@@ -203,11 +220,16 @@ module AbstractController
       #
       # ==== Returns
       # * <tt>string</tt> - The name of the method that handles the action
-      # * <tt>nil</tt>    - No method name could be found. Raise ActionNotFound.
+      # * <tt>nil</tt>    - No method name could be found.
       def method_for_action(action_name)
         if action_method?(action_name) then action_name
         elsif respond_to?(:action_missing, true) then "_handle_action_missing"
         end
       end
+
+      # Checks if the action name is valid and returns false otherwise.
+      def _valid_action_name?(action_name)
+        action_name.to_s !~ Regexp.new(File::SEPARATOR)
+      end
   end
 end