From be1eedf808c2c2520079f134114d6707ae5117b4 Mon Sep 17 00:00:00 2001
From: Eli Fidler <efidler@topologyinc.com>
Date: Tue, 31 May 2016 12:22:21 -0400
Subject: [PATCH] avoid signed-integer overflow, which is undefined behavior

UBSAN gave for test/unittest/itoatest.cpp:87:
runtime error: signed integer overflow: 4611686018427387904 * 2 cannot be represented in type 'long'
---
 test/unittest/itoatest.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/test/unittest/itoatest.cpp b/test/unittest/itoatest.cpp
index 79db1c7..b752a6a 100644
--- a/test/unittest/itoatest.cpp
+++ b/test/unittest/itoatest.cpp
@@ -84,6 +84,8 @@ static void Verify(void(*f)(T, char*), char* (*g)(T, char*)) {
                 VerifyValue<T>(Traits<T>::Negate(i + 1), f, g);
             }
             last = i;
+            if (i > static_cast<T>(std::numeric_limits<T>::max() / static_cast<T>(power)))
+                break;
             i *= power;
         } while (last < i);
     }