File GraphicsMagick-CVE-2017-17682.patch of Package GraphicsMagick.7893

Index: GraphicsMagick-1.3.25/coders/wpg.c
===================================================================
--- GraphicsMagick-1.3.25.orig/coders/wpg.c	2018-02-20 18:34:55.127867659 +0100
+++ GraphicsMagick-1.3.25/coders/wpg.c	2018-02-20 18:34:55.399872058 +0100
@@ -726,6 +726,9 @@ static Image *ExtractPostscript(Image *i
   FILE
     *ps_file;
 
+  int
+    c;
+
   ImageInfo
     *clone_info;
 
@@ -757,10 +760,13 @@ static Image *ExtractPostscript(Image *i
   magick_size=ReadBlob(image, sizeof(magick), magick);
   
   (void) SeekBlob(image,PS_Offset,SEEK_SET);
-  while(PS_Size-- > 0)
-    {
-      (void) fputc(ReadBlobByte(image),ps_file);
-    }
+  while (PS_Size-- > 0)
+  {
+    c=ReadBlobByte(image);
+    if (c == EOF)
+      break;
+    (void) fputc(c,ps_file);
+  }
   (void) fclose(ps_file);
   
   /* Detect file format - Check magic.mgk configuration file. */