From eacbdd623be13633c083fd2831eeb79e5381e089 Mon Sep 17 00:00:00 2001
From: Cristy <urban-warrior@imagemagick.org>
Date: Thu, 28 Dec 2017 19:55:30 -0500
Subject: [PATCH] Exit early on bad file descriptor

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

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index f6a7384e1..917fc0bdc 100644
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -3108,6 +3108,11 @@ MagickExport MagickBooleanType OpenBlob(const ImageInfo *image_info,
       *fileMode =(*type);
       fileMode[1]='\0';
       blob_info->file_info.file=fdopen(StringToLong(filename+3),fileMode);
+      if (blob_info->file_info.file == (FILE *) NULL)
+        {
+          ThrowFileException(exception,BlobError,"UnableToOpenBlob",filename);
+          return(MagickFalse);
+        }
 #if defined(MAGICKCORE_WINDOWS_SUPPORT) || defined(__OS2__)
       if (strchr(type,'b') != (char *) NULL)
         setmode(fileno(blob_info->file_info.file),_O_BINARY);
-- 
2.50.0