Sophie: imagemagick-6.8.9.9-4.2.mga5 src

imagemagick-6.8.9.9-4.2.mga5.src.rpm

From 5482197c8fd23e8545ed53c6088523c58702fcb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bastien=20ROUCARI=C3=88S?= <roucaries.bastien@gmail.com>
Date: Tue, 23 Dec 2014 15:39:55 +0100
Subject: Avoid an overflow in ConstrainColormapIndex

ConstrainColormapIndex is used like array[ConstrainColormapIndex]. Test if cast to ssize_t render it negative and thus crash later

Origin:  http://trac.imagemagick.org/changeset/17291

diff --git a/magick/colormap-private.h b/magick/colormap-private.h
index 0e96157..03c0b67 100644
--- a/magick/colormap-private.h
+++ b/magick/colormap-private.h
@@ -29,7 +29,7 @@ extern "C" {
 static inline IndexPacket ConstrainColormapIndex(Image *image,
   const size_t index)
 {
-  if (index < image->colors)
+  if ((index < image->colors) && ((ssize_t) index >= 0))
     return((IndexPacket) index);
   (void) ThrowMagickException(&image->exception,GetMagickModule(),
     CorruptImageError,"InvalidColormapIndex","`%s'",image->filename);
-- 
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