File ImageMagick-CVE-2020-27750.patch of Package ImageMagick.18390

diff --git a/MagickCore/colorspace-private.h b/MagickCore/colorspace-private.h
index b575a374ab..21d8e20e71 100644
--- a/MagickCore/colorspace-private.h
+++ b/MagickCore/colorspace-private.h
@@ -75,9 +75,9 @@ static inline void ConvertRGBToCMYK(PixelInfo *pixel)
     black=magenta;
   if (yellow < black)
     black=yellow;
-  cyan=(MagickRealType) ((cyan-black)/(1.0-black));
-  magenta=(MagickRealType) ((magenta-black)/(1.0-black));
-  yellow=(MagickRealType) ((yellow-black)/(1.0-black));
+  cyan=(MagickRealType) (PerceptibleReciprocal(1.0-black)*(cyan-black));
+  magenta=(MagickRealType) (PerceptibleReciprocal(1.0-black)*(magenta-black));
+  yellow=(MagickRealType) (PerceptibleReciprocal(1.0-black)*(yellow-black));
   pixel->colorspace=CMYKColorspace;
   pixel->red=QuantumRange*cyan;
   pixel->green=QuantumRange*magenta;
diff --git a/MagickWand/pixel-iterator.c b/MagickWand/pixel-iterator.c
index 32e9496538..826d560158 100644
--- a/MagickWand/pixel-iterator.c
+++ b/MagickWand/pixel-iterator.c
@@ -918,12 +918,12 @@ WandExport MagickBooleanType PixelSyncIterator(PixelIterator *iterator)
   MagickBooleanType
     status;
 
+  register Quantum
+    *magick_restrict pixels;
+
   register ssize_t
     x;
 
-  register Quantum
-    *_magickcore_restrict pixels;
-
   assert(iterator != (const PixelIterator *) NULL);
   assert(iterator->signature == MagickWandSignature);
   if (iterator->debug != MagickFalse)