From ddd289f766a573a85dc89c40c1f1592c5fb1903e Mon Sep 17 00:00:00 2001
From: Fabio Erculiani <lxnay@sabayon.org>
Date: Mon, 8 Aug 2011 18:14:41 +0200
Subject: [PATCH] [entropy.tools] dump_entropy_metadata(): check if file is
 empty before using mmap()

---
 libraries/entropy/tools.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/entropy/tools.py b/libraries/entropy/tools.py
index 0463940a5..65de3bcb9 100644
--- a/libraries/entropy/tools.py
+++ b/libraries/entropy/tools.py
@@ -1391,6 +1391,9 @@ def dump_entropy_metadata(entropy_package_file, entropy_metadata_file):
         old_mmap = None
         try:
             f_size = os.lstat(entropy_package_file).st_size
+            if f_size <= 0:
+                # WTF!
+                return False
             # avoid security flaw caused by file size growing race condition
             # we conside the file size static
             if f_size < mmap_size_th: