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

*** 737,746 ****
--- 737,757 ----
                  switch (chunkType) {
                  case IDAT_TYPE:
                      // If chunk type is 'IDAT', we've reached the image data.
                      if (imageStartPosition == -1L) {
                          /*
+                          * PNG specification mandates that if colorType is
+                          * PNG_COLOR_PALETTE then PLTE chunk should appear
+                          * before the first IDAT chunk.
+                          */
+                         if (colorType == PNG_COLOR_PALETTE &&
+                             !(metadata.PLTE_present))
+                         {
+                             throw new IIOException("PNG image doesn't contain"
+                                     + " required PLTE chunk");
+                         }
+                         /*
                           * PNGs may contain multiple IDAT chunks containing
                           * a portion of image data. We store the position of
                           * the first IDAT chunk and continue with iteration
                           * of other chunks that follow image data.
                           */