Index: include/llvm/Demangle/Utility.h
===================================================================
--- include/llvm/Demangle/Utility.h
+++ include/llvm/Demangle/Utility.h
@@ -175,13 +175,13 @@
   if (Buf == nullptr) {
     Buf = static_cast<char *>(std::malloc(InitSize));
     if (Buf == nullptr)
-      return true;
+      return false;
     BufferSize = InitSize;
   } else
     BufferSize = *N;
 
   S.reset(Buf, BufferSize);
-  return false;
+  return true;
 }
 
 #endif
Index: lib/Demangle/ItaniumDemangle.cpp
===================================================================
--- lib/Demangle/ItaniumDemangle.cpp
+++ lib/Demangle/ItaniumDemangle.cpp
@@ -334,7 +334,7 @@
 
   if (AST == nullptr)
     InternalStatus = demangle_invalid_mangled_name;
-  else if (initializeOutputStream(Buf, N, S, 1024))
+  else if (!initializeOutputStream(Buf, N, S, 1024))
     InternalStatus = demangle_memory_alloc_failure;
   else {
     assert(Parser.ForwardTemplateRefs.empty());
@@ -390,7 +390,7 @@
 
 static char *printNode(const Node *RootNode, char *Buf, size_t *N) {
   OutputStream S;
-  if (initializeOutputStream(Buf, N, S, 128))
+  if (!initializeOutputStream(Buf, N, S, 128))
     return nullptr;
   RootNode->print(S);
   S += '\0';
@@ -435,7 +435,7 @@
   const Node *Name = static_cast<const FunctionEncoding *>(RootNode)->getName();
 
   OutputStream S;
-  if (initializeOutputStream(Buf, N, S, 128))
+  if (!initializeOutputStream(Buf, N, S, 128))
     return nullptr;
 
  KeepGoingLocalFunction:
@@ -488,7 +488,7 @@
   NodeArray Params = static_cast<FunctionEncoding *>(RootNode)->getParams();
 
   OutputStream S;
-  if (initializeOutputStream(Buf, N, S, 128))
+  if (!initializeOutputStream(Buf, N, S, 128))
     return nullptr;
 
   S += '(';
@@ -506,7 +506,7 @@
     return nullptr;
 
   OutputStream S;
-  if (initializeOutputStream(Buf, N, S, 128))
+  if (!initializeOutputStream(Buf, N, S, 128))
     return nullptr;
 
   if (const Node *Ret =
Index: lib/Demangle/MicrosoftDemangle.cpp
===================================================================
--- lib/Demangle/MicrosoftDemangle.cpp
+++ lib/Demangle/MicrosoftDemangle.cpp
@@ -1017,7 +1017,7 @@
   // Render this class template name into a string buffer so that we can
   // memorize it for the purpose of back-referencing.
   OutputStream OS;
-  if (initializeOutputStream(nullptr, nullptr, OS, 1024))
+  if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
     // FIXME: Propagate out-of-memory as an error?
     std::terminate();
   Identifier->output(OS, OF_Default);
@@ -1349,7 +1349,7 @@
   if (MangledName.empty())
     goto StringLiteralError;
 
-  if (initializeOutputStream(nullptr, nullptr, OS, 1024))
+  if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
     // FIXME: Propagate out-of-memory as an error?
     std::terminate();
   if (IsWcharT) {
@@ -1472,7 +1472,7 @@
 
   // Render the parent symbol's name into a buffer.
   OutputStream OS;
-  if (initializeOutputStream(nullptr, nullptr, OS, 1024))
+  if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
     // FIXME: Propagate out-of-memory as an error?
     std::terminate();
   OS << '`';
@@ -2298,7 +2298,7 @@
 
   // Create an output stream so we can render each type.
   OutputStream OS;
-  if (initializeOutputStream(nullptr, nullptr, OS, 1024))
+  if (!initializeOutputStream(nullptr, nullptr, OS, 1024))
     std::terminate();
   for (size_t I = 0; I < Backrefs.FunctionParamCount; ++I) {
     OS.setCurrentPosition(0);
@@ -2336,7 +2336,7 @@
 
   if (D.Error)
     InternalStatus = demangle_invalid_mangled_name;
-  else if (initializeOutputStream(Buf, N, S, 1024))
+  else if (!initializeOutputStream(Buf, N, S, 1024))
     InternalStatus = demangle_memory_alloc_failure;
   else {
     AST->output(S, OF_Default);