Make sure the ban length is an integer

src/Channel.py

@@ -183,7 +183,11 @@ class Channel(callbacks.Privmsg):
             self.log.warning('%r tried to make me kban myself.', msg.prefix)
             irc.error(msg, 'I cowardly refuse to kickban myself.')
             return
-        length = int(length or 0)
+        try:
+            length = int(length or 0)
+        except ValueError:
+            irc.error(msg, 'Ban length must be a valid integer.')
+            return
         try:
             bannedHostmask = irc.state.nickToHostmask(bannedNick)
         except KeyError:

test/test_Channel.py

@@ -96,6 +96,7 @@ class ChannelTestCase(ChannelPluginTestCase, PluginDocumentation):
         m = self.getMsg(' ')
         self.assertEqual(m, ircmsgs.kick(self.channel, 'foobar', self.nick))
         self.assertNotRegexp('kban adlkfajsdlfkjsd', 'KeyError')
+        self.assertNotRegexp('kban foobar time', 'ValueError')
         self.assertError('kban %s' % self.nick)
 
     def testLobotomizers(self):