From 7f52a0ebf7d8f5edbe7382454b7c5d03bb0bb7dc Mon Sep 17 00:00:00 2001
From: Emil Velikov <emil.velikov@collabora.com>
Date: Tue, 15 May 2018 16:43:58 +0100
Subject: [PATCH] xf86drm: drmGetDevice2: error out if the fd has unknown
 subsys

Currently one can open() any /dev node. If it's unknown
drmParseSubsystemType() will return an error.

Track that and bail as needed.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Tested-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
---
 xf86drm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xf86drm.c b/xf86drm.c
index 87c216cf..e1bbbe99 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3814,6 +3814,8 @@ int drmGetDevice2(int fd, uint32_t flags, drmDevicePtr *device)
         return -EINVAL;
 
     subsystem_type = drmParseSubsystemType(maj, min);
+    if (subsystem_type < 0)
+        return subsystem_type;
 
     local_devices = calloc(max_count, sizeof(drmDevicePtr));
     if (local_devices == NULL)