From 31f40045de3ced9d6e30aaab4d18986534318090 Mon Sep 17 00:00:00 2001
From: Marco Amadori <marco.amadori@gmail.com>
Date: Thu, 7 Aug 2008 00:07:57 +0200
Subject: [PATCH] Be sure that the discovered filesystem is not null.

- While scanning for a filesystem on a disk, the klibc utility can
  return a null string if it not finds a filesystem (e.g. on a container
  partition), and grepping for a null string either reports true if
  escaped or hangs grep if not escaped. Both conditions must be avoided
  in order to report that the kernel supports the filesystem named as
  the string.
---
 scripts/live-helpers | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/live-helpers b/scripts/live-helpers
index e1f69dd..619cbb4 100644
--- a/scripts/live-helpers
+++ b/scripts/live-helpers
@@ -33,6 +33,12 @@ is_supported_fs ()
 {
 	fstype="${1}"
 
+	# Validate input first
+	if [ -z "${fstype}" ]
+	then
+		return 1
+	fi
+
 	# Try to look if it is already supported by the kernel
 	if grep -q ${fstype} /proc/filesystems
 	then
-- 
2.1.4