Fix use-after-free in ModuleManager

When removing out-of-date modules we might have left behind a VisitOrder
that contains pointers to freed ModuleFiles.  This was very rarely seen,
because it only happens when modules go out of date and the VisitOrder
happens to have the right size to not be recomputed.

Thanks ASan!

rdar://23181512

llvm-svn: 250963

1 files changed, 3 insertions, 0 deletions

diff --git a/clang/lib/Serialization/ModuleManager.cpp b/clang/lib/Serialization/ModuleManager.cpp
index f9d0fa469b2..74f75a103f7 100644
--- a/clang/lib/Serialization/ModuleManager.cpp
+++ b/clang/lib/Serialization/ModuleManager.cpp
@@ -194,6 +194,9 @@ void ModuleManager::removeModules(
   if (first == last)
     return;
 
+  // Explicitly clear VisitOrder since we might not notice it is stale.
+  VisitOrder.clear();
+
   // Collect the set of module file pointers that we'll be removing.
   llvm::SmallPtrSet<ModuleFile *, 4> victimSet(first, last);