Don't call fstat() on a closed file

diff --git a/MagickCore/blob.c b/MagickCore/blob.c
index 9f04f1d160e9004b1ef47f7301d5c9d936d30dec..77868e1bc74cc18417c16a898feb154fac9edb5b 100644 (file)
--- a/MagickCore/blob.c
+++ b/MagickCore/blob.c
@@ -1823,7 +1823,16 @@ MagickExport MagickSizeType GetBlobSize(const Image *image)
     }
     case FileStream:
     {
-      if (fstat(fileno(blob_info->file_info.file),&blob_info->properties) == 0)
+      int
+        file_descriptor;
+
+      extent=(MagickSizeType) blob_info->properties.st_size;
+      if (extent == 0)
+        extent=blob_info->size;
+      file_descriptor=fileno(blob_info->file_info.file);
+      if (file_descriptor == -1)
+        break;
+      if (fstat(file_descriptor,&blob_info->properties) == 0)
         extent=(MagickSizeType) blob_info->properties.st_size;
       break;
     }