From 0c5b1e430a83ef793a7334bbbee408cf3c628699 Mon Sep 17 00:00:00 2001
From: Dirk Lemstra <dirk@git.imagemagick.org>
Date: Mon, 15 May 2017 21:10:09 +0200
Subject: [PATCH] Added check to prevent image being 0x0 (reported in #489).

---
 coders/dds.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/coders/dds.c b/coders/dds.c
index eb9641d05..f1b1d8c71 100644
--- a/coders/dds.c
+++ b/coders/dds.c
@@ -1677,16 +1677,15 @@ static Image *ReadDDSImage(const ImageInfo *image_info,ExceptionInfo *exception)
   /*
     Initialize image structure.
   */
-  if (ReadDDSInfo(image, &dds_info) != MagickTrue) {
+  if (ReadDDSInfo(image, &dds_info) != MagickTrue)
     ThrowReaderException(CorruptImageError,"ImproperImageHeader");
-  }
-  
+
   if (dds_info.ddscaps2 & DDSCAPS2_CUBEMAP)
     cubemap = MagickTrue;
-  
+
   if (dds_info.ddscaps2 & DDSCAPS2_VOLUME && dds_info.depth > 0)
     volume = MagickTrue;
-  
+
   (void) SeekBlob(image, 128, SEEK_SET);
 
   /*
@@ -1775,7 +1774,10 @@ static Image *ReadDDSImage(const ImageInfo *image_info,ExceptionInfo *exception)
   
   if (volume)
     num_images = dds_info.depth;
-  
+
+  if (num_images < 1)
+    ThrowReaderException(CorruptImageError,"ImproperImageHeader");
+
   for (n = 0; n < num_images; n++)
   {
     if (n != 0)
-- 
2.40.0