BUGFIX:

  Use of uninitialized value $age in int at /usr/bin/firewall-blacklist
  line 608.

firewall/bin/firewall-blacklist

@@ -604,6 +604,8 @@ sub expireBlacklist
     #
     foreach my $file ( sort( glob("$CONFIG{'blacklist'}/*.auto") ) )
     {
+        next unless( -e $file );
+
         my $age = -M $file;
         if ( int($age) > $CONFIG{ 'expire' } )
         {

firewall/debian/changelog

-symbiosis-firewall (2010:0701) stable; urgency=low
+symbiosis-firewall (2010:0823) stable; urgency=low
 
   * Correctly process whitelisted IP addresses.
   * Expire whitelisted entries which are older than 8 days.
   * The blacklister will honour even auto-whitelisted IPs.
+  * Updated to avoid issues with unused blacklist files.
 
  -- Steve Kemp <steve@bytemark.co.uk>  Thu, 1 Jul 2010 12:00:00 +0000