From f7cd52aca92f4a3a0312c90f053b4fc3ce43eb1d Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <kyrtzidis@apple.com>
Date: Fri, 25 Aug 2023 11:40:07 -0700
Subject: [PATCH] [clang/CompileJobCache] Fix UBSan issue

---
 clang/lib/Frontend/CompileJobCache.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Frontend/CompileJobCache.cpp b/clang/lib/Frontend/CompileJobCache.cpp
index 048edec9c38c5a..8f279aa324eb6b 100644
--- a/clang/lib/Frontend/CompileJobCache.cpp
+++ b/clang/lib/Frontend/CompileJobCache.cpp
@@ -87,7 +87,8 @@ class ObjectStoreCachingOutputs : public CompileJobCache::CachingOutputs {
                        UseCASBackend),
         ComputedJobNeedsReplay(WriteOutputAsCASID || UseCASBackend),
         MCOutputID(MCOutputID), CAS(std::move(DB)), Cache(std::move(Cache)) {
-    CASOutputs = llvm::makeIntrusiveRefCnt<llvm::cas::CASOutputBackend>(*CAS);
+    if (CAS)
+      CASOutputs = llvm::makeIntrusiveRefCnt<llvm::cas::CASOutputBackend>(*CAS);
   }
 
   Expected<std::optional<int>>