From 5ba635cddad00e655a94f5df903999ad286126c8 Mon Sep 17 00:00:00 2001
From: Jan Vorlicek <janvorli@microsoft.com>
Date: Tue, 13 Jul 2021 11:00:01 +0200
Subject: [PATCH] Fix UMThunkMarshInfo delete

There was a forgotten call to c++ delete that should have been converted
to LoaderHeap::BackoutMem in a code path invoked only if two threads
raced for allocating the UMThunkMarshInfo and the one that lost the race
needed to delete it.
---
 src/coreclr/vm/comdelegate.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/coreclr/vm/comdelegate.cpp b/src/coreclr/vm/comdelegate.cpp
index 1b61e16dec5d3..03cecd838023b 100644
--- a/src/coreclr/vm/comdelegate.cpp
+++ b/src/coreclr/vm/comdelegate.cpp
@@ -1263,7 +1263,7 @@ LPVOID COMDelegate::ConvertToCallback(OBJECTREF pDelegateObj)
                                                         pUMThunkMarshInfo,
                                                         NULL ) != NULL)
                 {
-                    delete pUMThunkMarshInfo;
+                    pMT->GetLoaderAllocator()->GetStubHeap()->BackoutMem(pUMThunkMarshInfo, sizeof(UMThunkMarshInfo));
                     pUMThunkMarshInfo = pClass->m_pUMThunkMarshInfo;
                 }
             }