File ImageMagick-CVE-2014-9839.patch of Package ImageMagick

--- a/magick/colormap-private.h
+++ b/magick/colormap-private.h
@@ -29,7 +29,7 @@ extern "C" {
 static inline IndexPacket ConstrainColormapIndex(Image *image,
   const size_t index)
 {
-  if (index < image->colors)
+  if ((index < image->colors) && ((ssize_t) index >= 0))
     return((IndexPacket) index);
   (void) ThrowMagickException(&image->exception,GetMagickModule(),
     CorruptImageError,"InvalidColormapIndex","`%s'",image->filename);