From b02d4f4d72c5e0f76f331ed07fdc8178842d9b1f Mon Sep 17 00:00:00 2001
From: Tom Englund <tomenglund26@gmail.com>
Date: Tue, 20 Aug 2024 21:10:13 +0200
Subject: [PATCH] output: avoid crashing on no crtc (#58)

dual gpus can init with no crtc and later rescan for them, however
getRenderFormats might be called before that happends and null ptr
deref, guard against it.
---
 src/backend/drm/DRM.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/backend/drm/DRM.cpp b/src/backend/drm/DRM.cpp
index 66b7bb4..20e9165 100644
--- a/src/backend/drm/DRM.cpp
+++ b/src/backend/drm/DRM.cpp
@@ -1718,6 +1718,10 @@ size_t Aquamarine::CDRMOutput::getGammaSize() {
 }
 
 std::vector<SDRMFormat> Aquamarine::CDRMOutput::getRenderFormats() {
+    if (!connector->crtc || !connector->crtc->primary || connector->crtc->primary->formats.empty()) {
+        backend->log(AQ_LOG_ERROR, "Can't get formats: no crtc");
+        return {};
+    }
     return connector->crtc->primary->formats;
 }