File ImageMagick-CVE-2014-9843.patch of Package ImageMagick.3923

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File ImageMagick-CVE-2014-9843.patch of Package ImageMagick.3923

Index: ImageMagick-6.8.8-1/coders/psd.c
===================================================================
--- ImageMagick-6.8.8-1.orig/coders/psd.c	2016-06-16 13:41:34.251371530 +0200
+++ ImageMagick-6.8.8-1/coders/psd.c	2016-06-16 13:47:29.865179635 +0200
@@ -316,6 +316,16 @@ static ssize_t DecodePSDPixels(const siz
   const unsigned char *compact_pixels,const ssize_t depth,
   const size_t number_pixels,unsigned char *pixels)
 {
+#define CheckNumberCompactPixels \
+  if (packets == 0) \
+    return(i); \
+  packets--
+
+#define CheckNumberPixels(count) \
+  if (((ssize_t) i + count) > (ssize_t) number_pixels) \
+    return(i); \
+  i+=count
+
   int
     pixel;
 
@@ -332,21 +342,22 @@ static ssize_t DecodePSDPixels(const siz
   packets=(ssize_t) number_compact_pixels;
   for (i=0; (packets > 1) && (i < (ssize_t) number_pixels); )
   {
+    CheckNumberCompactPixels;
     length=(*compact_pixels++);
-    packets--;
     if (length == 128)
       continue;
     if (length > 128)
       {
         length=256-length+1;
+        CheckNumberCompactPixels;
         pixel=(*compact_pixels++);
-        packets--;
         for (j=0; j < (ssize_t) length; j++)
         {
           switch (depth)
           {
             case 1:
             {
+              CheckNumberPixels(8);
               *pixels++=(pixel >> 7) & 0x01 ? 0U : 255U;
               *pixels++=(pixel >> 6) & 0x01 ? 0U : 255U;
               *pixels++=(pixel >> 5) & 0x01 ? 0U : 255U;
@@ -355,29 +366,28 @@ static ssize_t DecodePSDPixels(const siz
               *pixels++=(pixel >> 2) & 0x01 ? 0U : 255U;
               *pixels++=(pixel >> 1) & 0x01 ? 0U : 255U;
               *pixels++=(pixel >> 0) & 0x01 ? 0U : 255U;
-              i+=8;
               break;
             }
             case 4:
             {
+              CheckNumberPixels(2);
               *pixels++=(unsigned char) ((pixel >> 4) & 0xff);
               *pixels++=(unsigned char) ((pixel & 0x0f) & 0xff);
-              i+=2;
               break;
             }
             case 2:
             {
+              CheckNumberPixels(4);
               *pixels++=(unsigned char) ((pixel >> 6) & 0x03);
               *pixels++=(unsigned char) ((pixel >> 4) & 0x03);
               *pixels++=(unsigned char) ((pixel >> 2) & 0x03);
               *pixels++=(unsigned char) ((pixel & 0x03) & 0x03);
-              i+=4;
               break;
             }
             default:
             {
+              CheckNumberPixels(1);
               *pixels++=(unsigned char) pixel;
-              i++;
               break;
             }
           }
@@ -391,6 +401,7 @@ static ssize_t DecodePSDPixels(const siz
       {
         case 1:
         {
+          CheckNumberPixels(8);
           *pixels++=(*compact_pixels >> 7) & 0x01 ? 0U : 255U;
           *pixels++=(*compact_pixels >> 6) & 0x01 ? 0U : 255U;
           *pixels++=(*compact_pixels >> 5) & 0x01 ? 0U : 255U;
@@ -399,32 +410,32 @@ static ssize_t DecodePSDPixels(const siz
           *pixels++=(*compact_pixels >> 2) & 0x01 ? 0U : 255U;
           *pixels++=(*compact_pixels >> 1) & 0x01 ? 0U : 255U;
           *pixels++=(*compact_pixels >> 0) & 0x01 ? 0U : 255U;
-          i+=8;
           break;
         }
         case 4:
         {
+          CheckNumberPixels(2);
           *pixels++=(*compact_pixels >> 4) & 0xff;
           *pixels++=(*compact_pixels & 0x0f) & 0xff;
-          i+=2;
           break;
         }
         case 2:
         {
+          CheckNumberPixels(4);
           *pixels++=(*compact_pixels >> 6) & 0x03;
           *pixels++=(*compact_pixels >> 4) & 0x03;
           *pixels++=(*compact_pixels >> 2) & 0x03;
           *pixels++=(*compact_pixels & 0x03) & 0x03;
-          i+=4;
           break;
         }
         default:
         {
+          CheckNumberPixels(1);
           *pixels++=(*compact_pixels);
-          i++;
           break;
         }
       }
+      CheckNumberCompactPixels;
       compact_pixels++;
     }
   }
@@ -845,13 +856,6 @@ static MagickStatusType ReadPSDChannelRL
     if ((MagickOffsetType) length < offsets[y])
       length=(size_t) offsets[y];
 
-  if (length > row_size + 256) // arbitrary number
-    {
-      pixels=(unsigned char *) RelinquishMagickMemory(pixels);
-      ThrowBinaryException(CoderError,"InvalidLength",
-        image->filename);
-    }
-
   compact_pixels=(unsigned char *) AcquireQuantumMemory(length,
     sizeof(*pixels));
   if (compact_pixels == (unsigned char *) NULL)

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