From d0c88e629394c9efbd45e1842de71e6cfee2ffeb Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Sun, 29 Apr 2018 09:33:20 +0200
Subject: [PATCH] check if jid was valid before parsing muc status or event
 msgs

---
 .../siacs/conversations/parser/MessageParser.java  |  8 ++++----
 .../eu/siacs/conversations/xmpp/InvalidJid.java    | 14 ++++++++++++--
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/src/main/java/eu/siacs/conversations/parser/MessageParser.java b/src/main/java/eu/siacs/conversations/parser/MessageParser.java
index 9184a1d60..37daec5a4 100644
--- a/src/main/java/eu/siacs/conversations/parser/MessageParser.java
+++ b/src/main/java/eu/siacs/conversations/parser/MessageParser.java
@@ -303,7 +303,7 @@ public class MessageParser extends AbstractParser implements OnMessagePacketRece
 			Log.e(Config.LOGTAG, account.getJid().asBareJid() + ": received groupchat (" + from + ") message on regular MAM request. skipping");
 			return;
 		}
-		boolean isMucStatusMessage = from.isBareJid() && mucUserElement != null && mucUserElement.hasChild("status");
+		boolean isMucStatusMessage = InvalidJid.hasValidFrom(packet) && from.isBareJid() && mucUserElement != null && mucUserElement.hasChild("status");
 		boolean selfAddressed;
 		if (packet.fromAccount(account)) {
 			status = Message.STATUS_SEND;
@@ -645,7 +645,7 @@ public class MessageParser extends AbstractParser implements OnMessagePacketRece
 					}
 				}
 			}
-			if (conversation != null && mucUserElement != null && from.isBareJid()) {
+			if (conversation != null && mucUserElement != null && InvalidJid.hasValidFrom(packet) && from.isBareJid()) {
 				for (Element child : mucUserElement.getChildren()) {
 					if ("status".equals(child.getName())) {
 						try {
@@ -746,12 +746,12 @@ public class MessageParser extends AbstractParser implements OnMessagePacketRece
 		}
 
 		Element event = original.findChild("event", "http://jabber.org/protocol/pubsub#event");
-		if (event != null) {
+		if (event != null && InvalidJid.hasValidFrom(original)) {
 			parseEvent(event, original.getFrom(), account);
 		}
 
 		final String nick = packet.findChildContent("nick", Namespace.NICK);
-		if (nick != null) {
+		if (nick != null && InvalidJid.hasValidFrom(original)) {
 			Contact contact = account.getRoster().getContact(from);
 			if (contact.setPresenceName(nick)) {
 				mXmppConnectionService.getAvatarService().clear(contact);
diff --git a/src/main/java/eu/siacs/conversations/xmpp/InvalidJid.java b/src/main/java/eu/siacs/conversations/xmpp/InvalidJid.java
index 66f6bfb90..de35ac73d 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/InvalidJid.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/InvalidJid.java
@@ -31,6 +31,7 @@ package eu.siacs.conversations.xmpp;
 
 import android.support.annotation.NonNull;
 
+import eu.siacs.conversations.xmpp.stanzas.AbstractStanza;
 import rocks.xmpp.addr.Jid;
 
 public class InvalidJid implements Jid {
@@ -140,10 +141,19 @@ public class InvalidJid implements Jid {
 	}
 
 	public static boolean isValid(Jid jid) {
-		if (jid != null && jid instanceof InvalidJid) {
+		return !(jid != null && jid instanceof InvalidJid);
+	}
+
+	public static boolean hasValidFrom(AbstractStanza stanza) {
+		final String from = stanza.getAttribute("from");
+		if (from == null) {
 			return false;
-		} else {
+		}
+		try {
+			Jid.ofEscaped(from);
 			return true;
+		} catch (IllegalArgumentException e) {
+			return false;
 		}
 	}
 }