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, 55 insertions, 0 deletions

diff --git a/Documentation/driver-api/media/index.rst b/Documentation/driver-api/media/index.rst
new file mode 100644
index 000000000..08fc2cfc0
--- /dev/null
+++ b/Documentation/driver-api/media/index.rst
@@ -0,0 +1,55 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+.. include:: <isonum.txt>
+
+===================================
+Media subsystem kernel internal API
+===================================
+
+This section contains usage information about media subsystem and
+its supported drivers.
+
+Please see:
+
+Documentation/admin-guide/media/index.rst
+
+  - for usage information about media subsystem and supported drivers;
+
+Documentation/userspace-api/media/index.rst
+
+  - for the userspace APIs used on media devices.
+
+
+.. toctree::
+    :caption: Table of Contents
+    :maxdepth: 5
+    :numbered:
+
+    maintainer-entry-profile
+    media-committers
+
+    v4l2-core
+    dtv-core
+    rc-core
+    mc-core
+    cec-core
+    tx-rx
+    camera-sensor
+
+    drivers/index
+
+**Copyright** |copy| 2009-2020 : LinuxTV Developers
+
+::
+
+  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.