From 505daceaaddc274b171625209879a5d07a6b29ef Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Sat, 2 May 2015 17:40:11 +0000
Subject: [PATCH]

---
 MagickCore/blob.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 8b9e6d366..8f2fe98ae 100644
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -125,6 +125,7 @@ struct _BlobInfo
 
   MagickBooleanType
     exempt,
+    immutable,
     synchronize,
     status,
     temporary;
@@ -198,6 +199,7 @@ MagickExport void AttachBlob(BlobInfo *blob_info,const void *blob,
     (void) LogMagickEvent(TraceEvent,GetMagickModule(),"...");
   blob_info->length=length;
   blob_info->extent=length;
+  blob_info->immutable=MagickTrue;
   blob_info->quantum=(size_t) MagickMaxBlobExtent;
   blob_info->offset=0;
   blob_info->type=BlobStream;
@@ -3767,7 +3769,8 @@ MagickExport MagickOffsetType SeekBlob(Image *image,
           image->blob->eof=MagickFalse;
           break;
         }
-      if (image->blob->mapped != MagickFalse)
+      if ((image->blob->mapped != MagickFalse) ||
+          (image->blob->immutable != MagickFalse))
         {
           image->blob->eof=MagickTrue;
           return(-1);
-- 
2.40.0