From: Peter Collingbourne <peter@pcc.me.uk>
Date: Sat, 21 Jan 2017 01:57:44 +0000 (+0000)
Subject: LowerTypeTests: Fix use-after-free. Found by asan/msan.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=9221d610b302f5eb53b7073c6afe7eee7b21dc67;p=llvm

LowerTypeTests: Fix use-after-free. Found by asan/msan.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@292700 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/IPO/LowerTypeTests.cpp b/lib/Transforms/IPO/LowerTypeTests.cpp
index 9ceb76a8e35..c7b9564c63f 100644
--- a/lib/Transforms/IPO/LowerTypeTests.cpp
+++ b/lib/Transforms/IPO/LowerTypeTests.cpp
@@ -1344,8 +1344,11 @@ bool LowerTypeTestsModule::lower() {
     return false;
 
   if (Action == SummaryAction::Import) {
-    for (const Use &U : TypeTestFunc->uses())
-      importTypeTest(cast<CallInst>(U.getUser()));
+    for (auto UI = TypeTestFunc->use_begin(), UE = TypeTestFunc->use_end();
+         UI != UE;) {
+      auto *CI = cast<CallInst>((*UI++).getUser());
+      importTypeTest(CI);
+    }
     return true;
   }