[plasma/kwin] /: autotests/integration/drm_test: don't crash if buffer allocation fails

Git commit c5236b4e375ebebe0cef2b58e5d871540c93804a by Xaver Hugl.
Committed on 16/07/2026 at 18:38.
Pushed by zamundaaa into branch 'master'.

autotests/integration/drm_test: don't crash if buffer allocation fails

M  +10   -1    autotests/integration/drm_test.cpp
M  +1    -1    src/backends/drm/drm_gpu.cpp

https://invent.kde.org/plasma/kwin/-/commit/c5236b4e375ebebe0cef2b58e5d871540c93804a

diff --git a/autotests/integration/drm_test.cpp b/autotests/integration/drm_test.cpp
index eef543a9be2..9689e4b4a7d 100644
--- a/autotests/integration/drm_test.cpp
+++ b/autotests/integration/drm_test.cpp
@@ -244,6 +244,10 @@ public:
             .software = false,
             .scanout = false,
         });
+        if (!m_buffer) {
+            qWarning("Allocating initial buffer on %s failed! %s", qPrintable(m_device->path()), strerror(errno));
+            return false;
+        }
         auto wlbuffer = Test::linuxDmabuf()->importBuffer(m_buffer.buffer());
         m_surface->attachBuffer(wlbuffer);
         m_surface->damage(QRect(QPoint(0, 0), size));
@@ -266,13 +270,18 @@ public:
                 if (!device) {
                     continue;
                 }
-                m_buffer = device->allocator()->allocate(GraphicsBufferOptions{
+                auto buffer = device->allocator()->allocate(GraphicsBufferOptions{
                     .size = m_buffer->size(),
                     .format = m_buffer->dmabufAttributes()->format,
                     .modifiers = tranche.formats[m_buffer->dmabufAttributes()->format],
                     .software = false,
                     .scanout = tranche.scanout,
                 });
+                if (!buffer) {
+                    qWarning("Allocating buffer on %s failed! %s", qPrintable(device->path()), strerror(errno));
+                    continue;
+                }
+                m_buffer = buffer;
                 auto wlbuffer = Test::linuxDmabuf()->importBuffer(m_buffer.buffer());
                 m_surface->attachBuffer(wlbuffer);
                 m_surface->damage(QRect(QPoint(0, 0), m_buffer->size()));
diff --git a/src/backends/drm/drm_gpu.cpp b/src/backends/drm/drm_gpu.cpp
index b089b055296..e54e3767c9e 100644
--- a/src/backends/drm/drm_gpu.cpp
+++ b/src/backends/drm/drm_gpu.cpp
@@ -1005,7 +1005,7 @@ std::shared_ptr<DrmFramebuffer> DrmGpu::importBuffer(GraphicsBuffer *buffer, Fil
     });
     for (int i = 0; i < attributes->planeCount; ++i) {
         if (drmPrimeFDToHandle(m_fd, attributes->fd[i].get(), &handles[i]) != 0) {
-            qCWarning(KWIN_DRM) << "drmPrimeFDToHandle() failed";
+            qCWarning(KWIN_DRM, "drmPrimeFDToHandle failed: %s", strerror(errno));
             return nullptr;
         }
     }