From 304a2efb44ebfd0cd2cf6bbf09cb586a228f778e Mon Sep 17 00:00:00 2001
From: Jelmer de Hen <18084450+jelmerdehen@users.noreply.github.com>
Date: Sun, 26 Apr 2026 04:04:27 +0200
Subject: [PATCH] fix(input): guard _sendEvent against null ui_device

_enableEvent destroys and recreates the uinput device on every key or
axis registration, and on failure leaves both 'device' and 'ui_device'
set to nullptr while continuing to run. Subsequent press/release calls
then dereferenced nullptr in libevdev_uinput_write_event, crashing the
daemon. Skip writes when ui_device is null.
---
 src/logid/InputDevice.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/logid/InputDevice.cpp b/src/logid/InputDevice.cpp
index 9d3169cb..ee490b95 100644
--- a/src/logid/InputDevice.cpp
+++ b/src/logid/InputDevice.cpp
@@ -178,6 +178,8 @@ void InputDevice::_enableEvent(const uint type, const uint code) {
 
 void InputDevice::_sendEvent(uint type, uint code, int value) {
     std::unique_lock lock(_input_mutex);
+    if (!ui_device)
+        return;
     libevdev_uinput_write_event(ui_device, type, code, value);
     libevdev_uinput_write_event(ui_device, EV_SYN, SYN_REPORT, 0);
 }