Index: sanitizer_common/sanitizer_vector.h
===================================================================
--- sanitizer_common/sanitizer_vector.h
+++ sanitizer_common/sanitizer_vector.h
@@ -95,8 +95,10 @@
   T *last_;
 
   void EnsureSize(uptr size) {
-    if (size <= Size())
+    if (size <= Size()) {
+      end_ = begin_ + size;
       return;
+    }
     if (size <= (uptr)(last_ - begin_)) {
       end_ = begin_ + size;
       return;