File ImageMagick-CVE-2016-6520.patch of Package ImageMagick.5842

Index: ImageMagick-6.8.9-8/magick/enhance.c
===================================================================
--- ImageMagick-6.8.9-8.orig/magick/enhance.c	2016-08-04 13:50:10.794189654 +0200
+++ ImageMagick-6.8.9-8/magick/enhance.c	2016-08-04 14:28:37.196657844 +0200
@@ -1184,6 +1184,8 @@ MagickExport MagickBooleanType ContrastS
   exception=(&image->exception);
   if (IsGrayImage(image,exception) != MagickFalse)
     (void) SetImageColorspace(image,GRAYColorspace);
+  if (SyncImagePixelCache(image,exception) == MagickFalse)
+    return(MagickFalse);
   status=MagickTrue;
   (void) ResetMagickMemory(histogram,0,(MaxMap+1)*sizeof(*histogram));
   image_view=AcquireAuthenticCacheView(image,exception);
@@ -1803,7 +1805,8 @@ MagickExport MagickBooleanType EqualizeI
   assert(image->signature == MagickSignature);
   if (image->debug != MagickFalse)
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"%s",image->filename);
-
+  if (SyncImagePixelCache(image,&image->exception) == MagickFalse)
+    return(MagickFalse);
   /* Call OpenCL version */
   status = AccelerateEqualizeImage(image, channel, &image->exception);
   if (status != MagickFalse)