From 677cd97dc4a930af508388713f5016baf664ed18 Mon Sep 17 00:00:00 2001
From: Rob Herring <robh@kernel.org>
Date: Fri, 21 Oct 2016 10:07:59 -0700
Subject: [PATCH] Return an -ENODEV from drmGetDevice() when no device was
 found.

Fixes crashes in Mesa on platform devices, which expected *device to
have a device when 0 was returned.

(code from a paste by Rob, commit message by anholt)

Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
---
 xf86drm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xf86drm.c b/xf86drm.c
index 9cfca49d..9b52889e 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3181,6 +3181,8 @@ int drmGetDevice(int fd, drmDevicePtr *device)
 
     closedir(sysdir);
     free(local_devices);
+    if (*device == NULL)
+	return -ENODEV;
     return 0;
 
 free_devices: