drm/mediatek: Add missing IS_ERR check for ovl_adaptor platform devicegrafted

platform_device_register_data() can fail and return an ERR_PTR, but the
return value is used without checking, leading to an invalid pointer
being stored in ddp_comp[].dev and passed to component_match_add() and
mtk_ddp_comp_init(), which could result in a kernel crash.

Add an IS_ERR() check to jump to the error handling path on failure.

Fixes: 0d9eee9118b7 ("drm/mediatek: Add drm ovl_adaptor sub driver for MT8195")
Cc: stable@vger.kernel.org
Signed-off-by: Haojie Li <lihaojie@kylinos.cn>
Reviewed-by: CK Hu <ck.hu@mediatek.com>
Link: https://patchwork.kernel.org/project/linux-mediatek/patch/20260825100845.438893-1-lihaojie@kylinos.cn/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

1 files changed, 67 insertions, 0 deletions

diff --git a/Documentation/userspace-api/media/index.rst b/Documentation/userspace-api/media/index.rst
new file mode 100644
index 000000000..337ef6c7c
--- /dev/null
+++ b/Documentation/userspace-api/media/index.rst
@@ -0,0 +1,67 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+########################################
+Linux Media Infrastructure userspace API
+########################################
+
+This section contains the  driver development information and Kernel APIs
+used by media devices.
+
+Please see:
+
+Documentation/admin-guide/media/index.rst
+
+  - for usage information about media subsystem and supported drivers;
+
+Documentation/driver-api/media/index.rst
+
+  - for driver development information and Kernel APIs used by
+    media devices;
+
+
+.. toctree::
+    :caption: Table of Contents
+    :maxdepth: 1
+
+    intro
+    v4l/v4l2
+    dvb/dvbapi
+    rc/remote_controllers
+    mediactl/media-controller
+    cec/cec-api
+    gen-errors
+
+    glossary
+
+    fdl-appendix
+
+    drivers/index
+
+**Copyright** |copy| 2009-2020 : LinuxTV Developers
+
+::
+
+  Permission is granted to copy, distribute and/or modify this document
+  under the terms of the GNU Free Documentation License, Version 1.1 or
+  any later version published by the Free Software Foundation, with no
+  Invariant Sections. A copy of the license is included in the chapter
+  entitled "GNU Free Documentation License".
+
+Please notice that some documents inside the media userspace API,
+when explicitly mentioned on its source code, are dual-licensed
+with GNU Free Documentation License  Version 1.1 and with the
+GNU General Public License::
+
+  This documentation is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by the Free
+  Software Foundation; either version 2 of the License, or (at your option) any
+  later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+  more details.
+
+  For more details see the file COPYING in the source distribution of Linux.