From: Joe Moriarty <joe.moriarty@oracle.com>
Date: Tue, 20 Feb 2018 14:11:57 -0500
Subject: drm: NULL pointer dereference [null-pointer-deref] (CWE 476) problem
Git-commit: 3bd07ccd27622d598fd9d87f3032dd457ad62083
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The Parfait (version 2.1.0) static code analysis tool found the
following NULL pointer dereference problem.

- drivers/gpu/drm/drm_drv.c
Any calls to drm_minor_get_slot() could result in the return of a NULL
pointer when an invalid DRM device type is encountered.  The
return of NULL was removed with BUG() from drm_minor_get_slot().

Signed-off-by: Joe Moriarty <joe.moriarty@oracle.com>
Reviewed-by: Steven Sistare <steven.sistare@oracle.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20180220191157.100960-3-joe.moriarty@oracle.com

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/drm_drv.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/drm_drv.c
+++ b/drivers/gpu/drm/drm_drv.c
@@ -99,7 +99,7 @@ static struct drm_minor **drm_minor_get_
 	case DRM_MINOR_CONTROL:
 		return &dev->control;
 	default:
-		return NULL;
+		BUG();
 	}
 }