yet another SIGNEXTEND fix

ethereumjs · Jun 18, 2017 · 9e9cc01 · 9e9cc01
1 parent a90b936
commit 9e9cc01
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/lib/opFns.js b/lib/opFns.js
@@ -133,6 +133,7 @@ module.exports = {
   },
   SIGNEXTEND: function (k, val, runState) {
     k = new BN(k)
+    val = new Buffer(val) // use clone, don't modify object reference
     var extendOnes = false
 
     if (k.cmpn(31) <= 0) {
@@ -146,7 +147,6 @@ module.exports = {
       for (var i = 30 - k; i >= 0; i--) {
         val[i] = extendOnes ? 0xff : 0
       }
-
     }
 
     return val