From 23ccb4d4c8133603dd4d0394ab10f0d7170c1b27 Mon Sep 17 00:00:00 2001
From: Mike Auty <mike.auty@gmail.com>
Date: Mon, 17 Jul 2017 17:11:05 +0100
Subject: [PATCH] Fix the real root cause, files not containing a banner.

---
 volatility/framework/automagic/linux.py              | 2 +-
 volatility/framework/automagic/linux_symbol_cache.py | 2 --
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/volatility/framework/automagic/linux.py b/volatility/framework/automagic/linux.py
index b5bbea84a..52b3db4b8 100644
--- a/volatility/framework/automagic/linux.py
+++ b/volatility/framework/automagic/linux.py
@@ -41,7 +41,7 @@ class LinuxSymbolFinder(interfaces.automagic.AutomagicInterface):
         if not self._linux_banners:
             return
 
-        mss = scanners.MultiStringScanner(list(self._linux_banners))
+        mss = scanners.MultiStringScanner([x for x in self._linux_banners if x is not None])
 
         layer = context.memory[layer_name]
 
diff --git a/volatility/framework/automagic/linux_symbol_cache.py b/volatility/framework/automagic/linux_symbol_cache.py
index ad01cbcd4..b59e92b7d 100644
--- a/volatility/framework/automagic/linux_symbol_cache.py
+++ b/volatility/framework/automagic/linux_symbol_cache.py
@@ -29,8 +29,6 @@ class LinuxSymbolCache(interfaces.automagic.AutomagicInterface):
                     vollog.log(constants.LOGLEVEL_V,
                                "Removing cached path {} for banner {}: files does not exist".format(path, banner))
                     linuxbanners[banner].remove(path)
-        # Rewrite it in case we found any files that were no logner present
-        cls.save_linux_banners(linuxbanners)
         return linuxbanners
 
     @classmethod