From b0173c236cf5a5045eac20f28caff8933a3663d6 Mon Sep 17 00:00:00 2001
From: Xaver Hugl <xaver.hugl@gmail.com>
Date: Wed, 19 Jan 2022 15:31:11 +0100
Subject: [PATCH] backends/drm: don't read configuration of zero outputs

Doesn't make any sense and can cause crashes
---
 src/backends/drm/drm_backend.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/backends/drm/drm_backend.cpp b/src/backends/drm/drm_backend.cpp
index 4d6efc69de..867a071c37 100644
--- a/src/backends/drm/drm_backend.cpp
+++ b/src/backends/drm/drm_backend.cpp
@@ -434,6 +434,7 @@ namespace KWinKScreenIntegration
 
 bool DrmBackend::readOutputsConfiguration(const QVector<DrmAbstractOutput*> &outputs)
 {
+    Q_ASSERT(!outputs.isEmpty());
     const auto outputsInfo = KWinKScreenIntegration::outputsConfig(outputs);
 
     AbstractWaylandOutput *primaryOutput = outputs.constFirst();
@@ -510,7 +511,7 @@ void DrmBackend::enableOutput(DrmAbstractOutput *output, bool enable)
             m_placeHolderOutput = nullptr;
         }
     } else {
-        if (m_enabledOutputs.count() == 1) {
+        if (m_enabledOutputs.count() == 1 && m_outputs.count() > 1) {
             auto outputs = m_outputs;
             outputs.removeOne(output);
             if (!readOutputsConfiguration(outputs)) {