From 62660bbd1526c6135d149df397b2470c6e71969d Mon Sep 17 00:00:00 2001
From: Aaron Plattner <aplattner@nvidia.com>
Date: Thu, 19 Jul 2018 10:51:34 -0700
Subject: [PATCH] gpu-kms: Don't crash if drmModeGetResources returns NULL

DRM drivers can be opened by meta_launcher_open_restricted() even if they don't
implement modesetting. However, drmModeGetResources() will return NULL.

Check whether that happened in meta_gpu_kms_new() and return with an error
instead of crashing.

Fixes #223.
---
 src/backends/native/meta-gpu-kms.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/backends/native/meta-gpu-kms.c b/src/backends/native/meta-gpu-kms.c
index 613a60705..259cd7122 100644
--- a/src/backends/native/meta-gpu-kms.c
+++ b/src/backends/native/meta-gpu-kms.c
@@ -801,6 +801,13 @@ meta_gpu_kms_new (MetaMonitorManagerKms  *monitor_manager_kms,
    */
   drm_resources = drmModeGetResources (kms_fd);
 
+  if (!drm_resources)
+    {
+      g_set_error (error, G_IO_ERROR, G_IO_ERROR_FAILED, "No resources");
+      meta_launcher_close_restricted (launcher, kms_fd);
+      return NULL;
+    }
+
   n_connectors = drm_resources->count_connectors;
 
   drmModeFreeResources (drm_resources);
-- 
2.19.0