--- old/src/java.base/share/native/libzip/zip_util.c	2015-05-08 10:54:32.659533000 -0700
+++ new/src/java.base/share/native/libzip/zip_util.c	2015-05-08 10:54:32.493534000 -0700
@@ -1206,7 +1206,7 @@
         }
 
         /* Slash is already there? */
-        if (name[ulen-1] == '/') {
+        if (ulen > 0 && name[ulen - 1] == '/') {
             break;
         }