File ImageMagick-CVE-2017-11639.patch of Package ImageMagick.16891

--- a/coders/cip.c
+++ b/coders/cip.c
@@ -240,13 +240,39 @@ static MagickBooleanType WriteCIPImage(const ImageInfo *image_info,Image *image)
     }
     if ((image->columns % 4) != 0)
       {
-        i=(ssize_t) image->columns % 4;
-        byte=(unsigned char)
-          ((((size_t) (3*ClampToQuantum(GetPixelLuma(image,p+MagickMin(i,3)))/QuantumRange) & 0x03) << 6) |
-           (((size_t) (3*ClampToQuantum(GetPixelLuma(image,p+MagickMin(i,2)))/QuantumRange) & 0x03) << 4) |
-           (((size_t) (3*ClampToQuantum(GetPixelLuma(image,p+MagickMin(i,1)))/QuantumRange) & 0x03) << 2) |
-           (((size_t) (3*ClampToQuantum(GetPixelLuma(image,p+MagickMin(i,0)))/QuantumRange) & 0x03) << 0));
-        (void) FormatLocaleString(buffer,MaxTextExtent,"%02x",~byte);
+        byte=0;
+        for ( ; x < (ssize_t) image->columns; x++)
+        {
+          i=x % 4;
+          switch (i)
+          {
+            case 0:
+            {
+              byte|=(unsigned char) (((size_t) (3*ClampToQuantum(GetPixelLuma(
+                image,p+MagickMin(i,3)))/QuantumRange) & 0x03) << 6);
+              break;
+            }
+            case 1:
+            {
+              byte|=(unsigned char) (((size_t) (3*ClampToQuantum(GetPixelLuma(
+                image,p+MagickMin(i,2)))/QuantumRange) & 0x03) << 4);
+              break;
+            }
+            case 2:
+            {
+              byte|=(unsigned char) (((size_t) (3*ClampToQuantum(GetPixelLuma(
+                image,p+MagickMin(i,1)))/QuantumRange) & 0x03) << 2);
+              break;
+            }
+            case 3:
+            {
+              byte|=(unsigned char) (((size_t) (3*ClampToQuantum(GetPixelLuma(
+                image,p+MagickMin(i,0)))/QuantumRange) & 0x03) << 0);
+              break;
+            }
+          }
+        }
+        (void) FormatLocaleString(buffer,MaxTextExtent,"%02x",~byte);
         (void) WriteBlobString(image,buffer);
       }
     status=SetImageProgress(image,SaveImageTag,(MagickOffsetType) y,