From: Cristy <urban-warrior@imagemagick.org>
Date: Mon, 1 Jan 2018 12:34:45 +0000 (-0500)
Subject: https://github.com/ImageMagick/ImageMagick/issues/926
X-Git-Tag: 7.0.7-19~1
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=977fe08bf69549506243226a2c8f2488a690b28b;p=imagemagick

https://github.com/ImageMagick/ImageMagick/issues/926
---

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 917fc0bdc..372f47f0e 100644
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -2719,6 +2719,8 @@ MagickExport MagickBooleanType IsBlobSeekable(const Image *image)
       int
         status;
 
+      if (fileno(blob_info->file_info.file) == -1)
+        return(MagickFalse);
       status=fseek(blob_info->file_info.file,0,SEEK_CUR);
       return(status == -1 ? MagickFalse : MagickTrue);
     }