File ImageMagick-CVE-2021-20224.patch of Package ImageMagick.25859

From 5af1dffa4b6ab984b5f13d1e91c95760d75f12a6 Mon Sep 17 00:00:00 2001
From: ruc_zhangxiaohui <553441439@qq.com>
Date: Thu, 7 Jan 2021 07:15:12 +0800
Subject: [PATCH] outside the range of representable values of type 'unsigned
 char' (#3083)

Co-authored-by: Zhang Xiaohui <ruc_zhangxiaohui@163.com>
---
 MagickCore/quantum-export.c | 26 +++++++++++++-------------
 1 file changed, 13 insertions(+), 13 deletions(-)

Index: ImageMagick-7.0.7-34/MagickCore/quantum-export.c
===================================================================
--- ImageMagick-7.0.7-34.orig/MagickCore/quantum-export.c
+++ ImageMagick-7.0.7-34/MagickCore/quantum-export.c
@@ -2529,28 +2529,28 @@ static void ExportIndexQuantum(const Ima
 
       for (x=((ssize_t) number_pixels-7); x > 0; x-=8)
       {
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q=((pixel & 0x01) << 7);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 6);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 5);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 4);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 3);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 2);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 1);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0x01) << 0);
         p+=GetPixelChannels(image);
         q++;
@@ -2560,7 +2560,7 @@ static void ExportIndexQuantum(const Ima
           *q='\0';
           for (bit=7; bit >= (ssize_t) (8-(number_pixels % 8)); bit--)
           {
-            pixel=(unsigned char) GetPixelIndex(image,p);
+            pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
             *q|=((pixel & 0x01) << (unsigned char) bit);
             p+=GetPixelChannels(image);
           }
@@ -2575,17 +2575,17 @@ static void ExportIndexQuantum(const Ima
 
       for (x=0; x < (ssize_t) (number_pixels-1) ; x+=2)
       {
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q=((pixel & 0xf) << 4);
         p+=GetPixelChannels(image);
-        pixel=(unsigned char) GetPixelIndex(image,p);
+        pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
         *q|=((pixel & 0xf) << 0);
         p+=GetPixelChannels(image);
         q++;
       }
       if ((number_pixels % 2) != 0)
         {
-          pixel=(unsigned char) GetPixelIndex(image,p);
+          pixel=(unsigned char) ((ssize_t) GetPixelIndex(image,p));
           *q=((pixel & 0xf) << 4);
           p+=GetPixelChannels(image);
           q++;
@@ -2596,7 +2596,7 @@ static void ExportIndexQuantum(const Ima
     {
       for (x=0; x < (ssize_t) number_pixels; x++)
       {
-        q=PopCharPixel((unsigned char) GetPixelIndex(image,p),q);
+        q=PopCharPixel((unsigned char) ((ssize_t) GetPixelIndex(image,p)),q);
         p+=GetPixelChannels(image);
         q+=quantum_info->pad;
       }