From 8475e1527ddc3fcfa3ed30846130e05e183935c6 Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Wed, 6 Jul 2011 13:12:21 -0700
Subject: [PATCH] punycode: Test for integer overflow

---
 lib/punycode.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/punycode.js b/lib/punycode.js
index a7c07a6634..64d8c61ade 100644
--- a/lib/punycode.js
+++ b/lib/punycode.js
@@ -28,6 +28,7 @@ var SKEW = 38;
 var DAMP = 700; // initial bias scaler
 var INITIAL_N = 128;
 var INITIAL_BIAS = 72;
+var MAX_INTEGER = Math.pow(2, 53);
 
 function adapt_bias(delta, n_points, is_first) {
   // scale back, then increase delta
@@ -151,7 +152,7 @@ function encode(input) {
     for (var i = 0; i < len; ++i) {
       var c = input[i];
       if (c < n) {
-        if (++delta == 0) {
+        if (++delta == MAX_INTEGER) {
           throw new Error('Delta overflow.');
         }
       }