--- old/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java	2017-11-20 16:12:57.873678000 +0530
+++ new/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java	2017-11-20 16:12:57.233358000 +0530
@@ -1698,5 +1698,6 @@
         gotMetadata = false;
         metadata = null;
         pixelStream = null;
+        imageStartPosition = -1L;
     }
 }