File ImageMagick-CVE-2019-15139.patch of Package ImageMagick.29977

Index: ImageMagick-6.8.8-1/coders/xwd.c
===================================================================
--- ImageMagick-6.8.8-1.orig/coders/xwd.c	2019-09-05 11:44:42.708548462 +0200
+++ ImageMagick-6.8.8-1/coders/xwd.c	2019-09-05 11:44:43.012550172 +0200
@@ -243,6 +243,8 @@ static Image *ReadXWDImage(const ImageIn
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   if (header.xoffset >= header.pixmap_width)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+  if ((MagickSizeType) header.xoffset >= GetBlobSize(image))
+    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
   switch (header.visual_class)
   {
     case StaticGray:
@@ -693,6 +695,7 @@ ModuleExport size_t RegisterXWDImage(voi
   entry->encoder=(EncodeImageHandler *) WriteXWDImage;
 #endif
   entry->magick=(IsImageFormatHandler *) IsXWD;
+  entry->seekable_stream=MagickTrue;
   entry->adjoin=MagickFalse;
   entry->description=ConstantString("X Windows system window dump (color)");
   entry->module=ConstantString("XWD");