--- pngpread.c.orig	2014-02-09 12:49:37.037470192 -0600
+++ pngpread.c	2014-02-22 23:02:52.213336245 -0600
@@ -234,6 +234,7 @@
          png_error(png_ptr, "Missing PLTE before IDAT");
 
       png_ptr->mode |= PNG_HAVE_IDAT;
+      png_ptr->process_mode = PNG_READ_IDAT_MODE;
 
       if (!(png_ptr->mode & PNG_HAVE_CHUNK_AFTER_IDAT))
          if (png_ptr->push_length == 0)