From 2797f478ceed622f7c825ec03053cee06f277e5f Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Mon, 26 May 2014 01:25:55 +0000
Subject: [PATCH]

---
 MagickCore/blob.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 678c5cfa4..59e4cf175 100644
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -3775,10 +3775,13 @@ MagickPrivate MagickBooleanType SetBlobExtent(Image *image,
       if (image->blob->synchronize != MagickFalse)
         {
           int
+            file,
             status;
 
-          status=posix_fallocate(fileno(image->blob->file_info.file),offset,
-            extent-offset);
+          file=fileno(image->blob->file_info.file);
+          if ((file == -1) || (offset < 0))
+            return(MagickFalse);
+          status=posix_fallocate(file,offset,extent-offset);
           if (status != 0)
             return(MagickFalse);
         }
-- 
2.50.1