From 5e2834335008189466bdd1a320b66b96e6448393 Mon Sep 17 00:00:00 2001
From: Tulir Asokan <tulir@maunium.net>
Date: Thu, 2 Mar 2023 14:14:49 +0200
Subject: [PATCH] Lock latest event backfill lock when handling Matrix messages

---
 portal.go | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/portal.go b/portal.go
index 926647d..59613d4 100644
--- a/portal.go
+++ b/portal.go
@@ -313,6 +313,8 @@ func (portal *Portal) handleMessageLoopItem(msg PortalMessage) {
 }
 
 func (portal *Portal) handleMatrixMessageLoopItem(msg PortalMatrixMessage) {
+	portal.latestEventBackfillLock.Lock()
+	defer portal.latestEventBackfillLock.Unlock()
 	evtTS := time.UnixMilli(msg.evt.Timestamp)
 	timings := messageTimings{
 		initReceive:  msg.evt.Mautrix.ReceivedAt.Sub(evtTS),