--- a/jdk/src/java.security.jgss/share/classes/sun/security/krb5/Config.java	Wed Jul 05 20:16:23 2017 +0200
+++ b/jdk/src/java.security.jgss/share/classes/sun/security/krb5/Config.java	Mon Jan 26 09:29:29 2015 +0800
@@ -913,9 +913,9 @@
 
     private static String unquote(String s) {
         s = s.trim();
-        if (s.isEmpty()) return s;
-        if (s.charAt(0) == '"' && s.charAt(s.length()-1) == '"' ||
-                s.charAt(0) == '\'' && s.charAt(s.length()-1) == '\'') {
+        if (s.length() >= 2 &&
+                ((s.charAt(0) == '"' && s.charAt(s.length()-1) == '"') ||
+                 (s.charAt(0) == '\'' && s.charAt(s.length()-1) == '\''))) {
             s = s.substring(1, s.length()-1).trim();
         }
         return s;