Index: tools/llvm-stress/llvm-stress.cpp
===================================================================
--- tools/llvm-stress/llvm-stress.cpp
+++ tools/llvm-stress/llvm-stress.cpp
@@ -116,10 +116,14 @@
 
   /// Make this like a C++11 random device
   typedef uint32_t result_type;
-  uint32_t operator()() { return Rand32(); }
   static constexpr result_type min() { return 0; }
   static constexpr result_type max() { return 0x7ffff; }
-  
+  uint32_t operator()() {
+    uint32_t Val = Rand();
+    assert(Val <= max() && "Random value out of range");
+    return Val;
+  }
+
 private:
   unsigned Seed;
 };