diff -r cbcd2afb6070 -r c5082624b79f jdk/src/java.base/share/classes/sun/security/x509/IPAddressName.java
--- a/jdk/src/java.base/share/classes/sun/security/x509/IPAddressName.java	Thu Sep 03 09:33:04 2015 +0200
+++ b/jdk/src/java.base/share/classes/sun/security/x509/IPAddressName.java	Mon Sep 07 18:58:41 2015 +0300
@@ -197,8 +197,10 @@
 
             // append a mask corresponding to the num of prefix bits specified
             int prefixLen = Integer.parseInt(name.substring(slashNdx+1));
-            if (prefixLen > 128)
-                throw new IOException("IPv6Address prefix is longer than 128");
+            if (prefixLen < 0 || prefixLen > 128) {
+                throw new IOException("IPv6Address prefix length (" +
+                        prefixLen + ") in out of valid range [0,128]");
+            }
 
             // create new bit array initialized to zeros
             BitArray bitArray = new BitArray(MASKSIZE * 8);
@@ -317,7 +319,8 @@
         if (!(obj instanceof IPAddressName))
             return false;
 
-        byte[] other = ((IPAddressName)obj).getBytes();
+        IPAddressName otherName = (IPAddressName)obj;
+        byte[] other = otherName.address;
 
         if (other.length != address.length)
             return false;
@@ -326,12 +329,10 @@
             // Two subnet addresses
             // Mask each and compare masked values
             int maskLen = address.length/2;
-            byte[] maskedThis = new byte[maskLen];
-            byte[] maskedOther = new byte[maskLen];
             for (int i=0; i < maskLen; i++) {
-                maskedThis[i] = (byte)(address[i] & address[i+maskLen]);
-                maskedOther[i] = (byte)(other[i] & other[i+maskLen]);
-                if (maskedThis[i] != maskedOther[i]) {
+                byte maskedThis = (byte)(address[i] & address[i+maskLen]);
+                byte maskedOther = (byte)(other[i] & other[i+maskLen]);
+                if (maskedThis != maskedOther) {
                     return false;
                 }
             }
@@ -400,7 +401,8 @@
         else if (((IPAddressName)inputName).equals(this))
             constraintType = NAME_MATCH;
         else {
-            byte[] otherAddress = ((IPAddressName)inputName).getBytes();
+            IPAddressName otherName = (IPAddressName)inputName;
+            byte[] otherAddress = otherName.address;
             if (otherAddress.length == 4 && address.length == 4)
                 // Two host addresses
                 constraintType = NAME_SAME_TYPE;