File ImageMagick-CVE-2014-8355.patch of Package ImageMagick.7537

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File ImageMagick-CVE-2014-8355.patch of Package ImageMagick.7537

http://trac.imagemagick.org/changeset/16773
Index: coders/pcx.c
===================================================================
--- coders/pcx.c.orig	2014-05-25 00:17:45.000000000 +0200
+++ coders/pcx.c	2014-11-04 09:43:56.589312155 +0100
@@ -221,6 +221,13 @@
 
 static Image *ReadPCXImage(const ImageInfo *image_info,ExceptionInfo *exception)
 {
+#define ThrowPCXException(severity,tag) \
+  { \
+    scanline=(unsigned char *) RelinquishMagickMemory(scanline); \
+    pixel_info=RelinquishVirtualMemory(pixel_info); \
+    ThrowReaderException(severity,tag); \
+  }
+
   Image
     *image;
 
@@ -268,7 +275,7 @@
 
   unsigned char
     packet,
-    *pcx_colormap,
+    pcx_colormap[768],
     *pixels,
     *scanline;
 
@@ -321,7 +328,6 @@
       if (offset < 0)
         ThrowReaderException(CorruptImageError,"ImproperImageHeader");
     }
-  pcx_colormap=(unsigned char *) NULL;
   count=ReadBlob(image,1,&pcx_info.identifier);
   for (id=1; id < 1024; id++)
   {
@@ -360,10 +366,6 @@
     image->x_resolution=(double) pcx_info.horizontal_resolution;
     image->y_resolution=(double) pcx_info.vertical_resolution;
     image->colors=16;
-    pcx_colormap=(unsigned char *) AcquireQuantumMemory(256UL,
-      3*sizeof(*pcx_colormap));
-    if (pcx_colormap == (unsigned char *) NULL)
-      ThrowReaderException(ResourceLimitError,"MemoryAllocationFailed");
     count=ReadBlob(image,3*image->colors,pcx_colormap);
     pcx_info.reserved=(unsigned char) ReadBlobByte(image);
     pcx_info.planes=(unsigned char) ReadBlobByte(image);
@@ -397,6 +399,9 @@
       Read image data.
     */
     pcx_packets=(size_t) image->rows*pcx_info.bytes_per_line*pcx_info.planes;
+    if ((size_t) (pcx_info.bits_per_pixel*pcx_info.planes*image->columns) >
+        (pcx_packets*8U))
+      ThrowReaderException(CorruptImageError,"ImproperImageHeader");
     scanline=(unsigned char *) AcquireQuantumMemory(MagickMax(image->columns,
       pcx_info.bytes_per_line),MagickMax(8,pcx_info.planes)*sizeof(*scanline));
     pixel_info=AcquireVirtualMemory(pcx_packets,sizeof(*pixels));
@@ -419,7 +424,7 @@
       {
         packet=(unsigned char) ReadBlobByte(image);
         if (EOFBlob(image) != MagickFalse)
-          ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
+          ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
         *p++=packet;
         pcx_packets--;
       }
@@ -428,7 +433,7 @@
       {
         packet=(unsigned char) ReadBlobByte(image);
         if (EOFBlob(image) != MagickFalse)
-          ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
+          ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
         if ((packet & 0xc0) != 0xc0)
           {
             *p++=packet;
@@ -438,7 +443,7 @@
         count=(ssize_t) (packet & 0x3f);
         packet=(unsigned char) ReadBlobByte(image);
         if (EOFBlob(image) != MagickFalse)
-          ThrowReaderException(CorruptImageError,"UnexpectedEndOfFile");
+          ThrowPCXException(CorruptImageError,"UnexpectedEndOfFile");
         for ( ; count != 0; count--)
         {
           *p++=packet;
@@ -457,7 +462,7 @@
             Initialize image colormap.
           */
           if (image->colors > 256)
-            ThrowReaderException(CorruptImageError,"ColormapExceeds256Colors");
+            ThrowPCXException(CorruptImageError,"ColormapExceeds256Colors");
           if ((pcx_info.bits_per_pixel*pcx_info.planes) == 1)
             {
               /*
@@ -486,7 +491,6 @@
                   image->colormap[i].blue=ScaleCharToQuantum(*p++);
                 }
             }
-          pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
         }
     /*
       Convert PCX raster image to pixel packets.
@@ -642,8 +646,6 @@
     }
     if (image->storage_class == PseudoClass)
       (void) SyncImage(image);
-    if (pcx_colormap != (unsigned char *) NULL)
-      pcx_colormap=(unsigned char *) RelinquishMagickMemory(pcx_colormap);
     scanline=(unsigned char *) RelinquishMagickMemory(scanline);
     pixel_info=RelinquishVirtualMemory(pixel_info);
     if (EOFBlob(image) != MagickFalse)

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