From f6d65dd1b2ff3ed4cc9e68bdf581ef6643b14c71 Mon Sep 17 00:00:00 2001
From: Owen Davies <obduk@users.noreply.github.com>
Date: Mon, 11 Jul 2016 15:03:21 +0100
Subject: [PATCH] Close file in SanitizedFile#mime_magic_content_type

Fixes bug where file handles are being left open. This was introduced in #1934
and #1936
---
 lib/carrierwave/sanitized_file.rb | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/carrierwave/sanitized_file.rb b/lib/carrierwave/sanitized_file.rb
index 8ad6b6d5f..543344ae3 100644
--- a/lib/carrierwave/sanitized_file.rb
+++ b/lib/carrierwave/sanitized_file.rb
@@ -315,7 +315,11 @@ def existing_content_type
     end
 
     def mime_magic_content_type
-      MimeMagic.by_magic(File.open(path)).try(:type) if path
+      if path
+        File.open(path) do |file|
+          MimeMagic.by_magic(file).try(:type)
+        end
+      end
     rescue Errno::ENOENT
       nil
     end