ignore roster pushes from unknown sender. fixes #3098

src/common/xmpp/roster.py

@@ -64,6 +64,10 @@ class Roster(PlugIn):
     def RosterIqHandler(self,dis,stanza):
         """ Subscription tracker. Used internally for setting items state in
             internal roster representation. """
+        sender = stanza.getAttr('from')
+        if not sender == None: and not sender.bareMatch(
+        self._owner.User + '@' + self._owner.Server):
+            return
         for item in stanza.getTag('query').getTags('item'):
             jid=item.getAttr('jid')
             if item.getAttr('subscription')=='remove':