From 8d06347a4ba1f135b04e0fc2e2008458cba91774 Mon Sep 17 00:00:00 2001
From: Ryan Harrison <rharrison@google.com>
Date: Mon, 31 May 2021 16:31:45 -0400
Subject: [PATCH] Check that valid bitcasted constant was returned

This call returns nullptr to indicate errors.

Fixes https://crbug.com/1213365
---
 source/opt/folding_rules.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/source/opt/folding_rules.cpp b/source/opt/folding_rules.cpp
index e6add1516b..e3e926c3a5 100644
--- a/source/opt/folding_rules.cpp
+++ b/source/opt/folding_rules.cpp
@@ -1867,6 +1867,8 @@ FoldingRule BitCastScalarOrVector() {
 
     const analysis::Constant* bitcasted_constant =
         ConvertWordsToNumericScalarOrVectorConstant(const_mgr, words, type);
+    if (!bitcasted_constant) return false;
+
     auto new_feeder_id =
         const_mgr->GetDefiningInstruction(bitcasted_constant, inst->type_id())
             ->result_id();