From 2282144efa9471c49254b962f9f876324b954e07 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

(cherry picked from commit f7cd52aca92f4a3a0312c90f053b4fc3ce43eb1d)
---
 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 549d2c9c15c88..b08d99cfe82b1 100644
--- a/clang/lib/Frontend/CompileJobCache.cpp
+++ b/clang/lib/Frontend/CompileJobCache.cpp
@@ -78,7 +78,8 @@ class ObjectStoreCachingOutputs : public CompileJobCache::CachingOutputs {
                             std::shared_ptr<llvm::cas::ActionCache> Cache)
       : CachingOutputs(Clang, std::move(Mapper)), 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>>