From d4d1caafc8d12d5df5c98b2aec5acf5c10ea22d1 Mon Sep 17 00:00:00 2001
From: Juneyoung Lee <aqjune@gmail.com>
Date: Sun, 2 May 2021 13:44:43 +0900
Subject: [PATCH] Fix MSan crash after 1977c53b

---
 llvm/lib/Analysis/OverflowInstAnalysis.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/Analysis/OverflowInstAnalysis.cpp b/llvm/lib/Analysis/OverflowInstAnalysis.cpp
index 2456ae9..9f17d5b 100644
--- a/llvm/lib/Analysis/OverflowInstAnalysis.cpp
+++ b/llvm/lib/Analysis/OverflowInstAnalysis.cpp
@@ -38,7 +38,8 @@ bool llvm::isCheckForZeroAndMulWithOverflow(Value *Op0, Value *Op1, bool IsAnd,
       return false;
 
     II = dyn_cast<IntrinsicInst>(Extract->getAggregateOperand());
-    if (!match(II, m_CombineOr(m_Intrinsic<Intrinsic::umul_with_overflow>(),
+    if (!II ||
+        !match(II, m_CombineOr(m_Intrinsic<Intrinsic::umul_with_overflow>(),
                                m_Intrinsic<Intrinsic::smul_with_overflow>())))
       return false;
 
-- 
2.7.4