From d4a4144b622e4304ca04d450807a18807027ab38 Mon Sep 17 00:00:00 2001
From: "Yi Zhang (CLR)" <yizhang82@users.noreply.github.com>
Date: Sat, 10 Jun 2017 09:08:41 -0700
Subject: [PATCH] Disable IEnumerable.GetEnumerator on RCW through IDispatch
 (#11865)

---
 src/vm/mngstdinterfaces.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/vm/mngstdinterfaces.cpp b/src/vm/mngstdinterfaces.cpp
index ec1475d..5aafe8a 100644
--- a/src/vm/mngstdinterfaces.cpp
+++ b/src/vm/mngstdinterfaces.cpp
@@ -994,8 +994,9 @@ FCIMPL1(Object*, StdMngIEnumerable::GetEnumerator, Object* refThisUNSAFE)
 
     if (retVal == NULL)
     {
-        // classic COM interop scenario
-        retVal = ObjectToOBJECTREF((Object*)GetEnumeratorWorker(args));
+        // In desktop CLR we'll attempt to call through IDispatch(DISPID_NEWENUM)
+        // This is not supported in CoreCLR
+        COMPlusThrow(kPlatformNotSupportedException, IDS_EE_ERROR_IDISPATCH);
     }
 
     GCPROTECT_END();
-- 
2.7.4