From 59bd71ddcacf1bba321dbce0d7a7e3971d71383a Mon Sep 17 00:00:00 2001
From: Rafael Sadowski <rafael@sizeofvoid.org>
Date: Sat, 8 Jun 2024 07:02:38 +0200
Subject: [PATCH] Verify USB listener callback handle

Do not use `handle` if `libusb_hotplug_register_callback` fails
---
 src/gui/osutils/nixutils/DeviceListenerLibUsb.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/gui/osutils/nixutils/DeviceListenerLibUsb.cpp b/src/gui/osutils/nixutils/DeviceListenerLibUsb.cpp
index 252126025..97233fbb0 100644
--- a/src/gui/osutils/nixutils/DeviceListenerLibUsb.cpp
+++ b/src/gui/osutils/nixutils/DeviceListenerLibUsb.cpp
@@ -97,11 +97,13 @@ DeviceListenerLibUsb::registerHotplugCallback(bool arrived, bool left, int vendo
         // Avoid race conditions
         m_usbEvents.waitForFinished();
     }
-    if (!m_usbEvents.isRunning()) {
-        m_completed = false;
-        m_usbEvents = QtConcurrent::run(handleUsbEvents, static_cast<libusb_context*>(m_ctx), &m_completed);
+    if (handle > 0) {
+        m_callbackHandles.insert(handle);
+        if (!m_usbEvents.isRunning()) {
+            m_completed = false;
+            m_usbEvents = QtConcurrent::run(handleUsbEvents, static_cast<libusb_context*>(m_ctx), &m_completed);
+        }
     }
-    m_callbackHandles.insert(handle);
     return handle;
 }