From cd401f5e37b8517c2a6d39e2746d8295d56ebf92 Mon Sep 17 00:00:00 2001
From: Shannon <sdeminick@gmail.com>
Date: Mon, 21 Mar 2016 16:12:34 +0100
Subject: [PATCH] U4-8216 Hijacked controller actions fail with custom
 RenderModel subclass due to ModelBinding error

---
 src/Umbraco.Web/Mvc/RenderModelBinder.cs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/Umbraco.Web/Mvc/RenderModelBinder.cs b/src/Umbraco.Web/Mvc/RenderModelBinder.cs
index 149194dbd0..735f015afc 100644
--- a/src/Umbraco.Web/Mvc/RenderModelBinder.cs
+++ b/src/Umbraco.Web/Mvc/RenderModelBinder.cs
@@ -174,9 +174,15 @@ namespace Umbraco.Web.Mvc
 
         public IModelBinder GetBinder(Type modelType)
         {
-            return TypeHelper.IsTypeAssignableFrom<IRenderModel>(modelType) || TypeHelper.IsTypeAssignableFrom<IPublishedContent>(modelType)
-                ? this
-                : null;
+            // can bind to RenderModel (exact type match)
+            if (modelType == typeof(RenderModel)) return this;
+
+            // can bind to RenderModel<TContent> (exact generic type match)
+            if (modelType.IsGenericType && modelType.GetGenericTypeDefinition() == typeof(RenderModel<>)) return this;
+
+            // can bind to TContent where TContent : IPublishedContent (any IPublishedContent implementation)
+            if (typeof(IPublishedContent).IsAssignableFrom(modelType)) return this;
+            return null;
         }
     }
 }
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