From 1e20d730730a831fccc5844d57f60231af90e1c1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?M=C3=A5rten=20Nordheim?= <marten.nordheim@qt.io>
Date: Mon, 20 Feb 2023 14:50:56 +0100
Subject: [PATCH] Torrent example: Fix use-after-free crash

The crash would sometimes happen shortly after removing a torrent
since the RateController would still try to use it even though
it had been deallocated.

Task-number: QTBUG-110622
Change-Id: Icad1531ea58560a3a3157a3ed8c0e6b283573196
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Konrad Kujawa <konrad.kujawa@qt.io>
(cherry picked from commit 32098963f2af064cce42fd5477f2a3137a315aba)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
---
 examples/network/torrent/torrentclient.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/examples/network/torrent/torrentclient.cpp b/examples/network/torrent/torrentclient.cpp
index 5b6edc6dad1..6082e93b014 100644
--- a/examples/network/torrent/torrentclient.cpp
+++ b/examples/network/torrent/torrentclient.cpp
@@ -208,6 +208,10 @@ TorrentClient::TorrentClient(QObject *parent)
 
 TorrentClient::~TorrentClient()
 {
+    auto rateController = RateController::instance();
+    const auto childSockets = findChildren<PeerWireClient *>(Qt::FindDirectChildrenOnly);
+    for (PeerWireClient *socket : childSockets)
+        rateController->removeSocket(socket);
     qDeleteAll(d->peers);
     qDeleteAll(d->pendingPieces);
     delete d;