From 4fc26f127e9cc6a9a0ee6f9bfeb6a7afb8a8285e Mon Sep 17 00:00:00 2001
From: nxshock <nxshock@gmail.com>
Date: Thu, 8 Aug 2019 20:02:46 +0500
Subject: [PATCH] Fix SetTopic mutex infinity lock

---
 internal/backends/memory/user.go | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/internal/backends/memory/user.go b/internal/backends/memory/user.go
index bb6415e..eb2fd25 100644
--- a/internal/backends/memory/user.go
+++ b/internal/backends/memory/user.go
@@ -114,14 +114,16 @@ func (user *User) SetTopic(room internal.Room, topic string) models.ApiError {
 	memRoom := room.(*Room)
 
 	memRoom.mutex.Lock()
-	defer memRoom.mutex.Unlock()
 
 	if memRoom.creator.ID() != user.ID() { // TODO: currently only creator can change topic
+		memRoom.mutex.Unlock()
 		return models.NewError(models.M_FORBIDDEN, "")
 	}
 
 	memRoom.topic = topic
 
+	memRoom.mutex.Unlock()
+
 	rEvent := &RoomEvent{
 		Type:           rooms.Topic,
 		Sender:         user,