--- xnu/xnu-3248.50.21/libkern/c++/OSNumber.cpp
+++ xnu/xnu-4570.71.2/libkern/c++/OSNumber.cpp
@@ -52,6 +52,8 @@
 bool OSNumber::init(unsigned long long inValue, unsigned int newNumberOfBits)
 {
     if (!super::init())
+        return false;
+    if (newNumberOfBits > 64)
         return false;
 
     size = newNumberOfBits;