src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageWriter.java

*** 191,201 ****
--- 191,211 ----
          stream.seek(startPos);
          stream.writeInt((int)(pos - startPos) - 12);
  
          // Return to end of chunk and flush to minimize buffering
          stream.seek(pos);
+         try {
              stream.flushBefore(pos);
+         } catch (IOException e) {
+             /*
+              * If flushBefore() fails we try to access startPos in finally
+              * block of write_IDAT(). We should update startPos to avoid
+              * IndexOutOfBoundException while seek() is happening.
+              */
+             this.startPos = stream.getStreamPosition();
+             throw e;
+         }
      }
  
      public int read() throws IOException {
          throw new RuntimeException("Method not available");
      }