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

llvm-svn: 292700

diff --git a/llvm/lib/Transforms/IPO/LowerTypeTests.cpp b/llvm/lib/Transforms/IPO/LowerTypeTests.cpp
index 9ceb76a..c7b9564 100644 (file)
--- a/llvm/lib/Transforms/IPO/LowerTypeTests.cpp
+++ b/llvm/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;
   }