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, 57 insertions, 0 deletions

diff --git a/Documentation/devicetree/kernel-api.rst b/Documentation/devicetree/kernel-api.rst
new file mode 100644
index 000000000..b7429e6ed
--- /dev/null
+++ b/Documentation/devicetree/kernel-api.rst
@@ -0,0 +1,57 @@
+.. SPDX-License-Identifier: GPL-2.0
+.. _devicetree:
+
+======================================
+DeviceTree Kernel API
+======================================
+
+Core functions
+--------------
+
+.. kernel-doc:: drivers/of/base.c
+   :export:
+
+.. kernel-doc:: include/linux/of.h
+   :internal:
+
+.. kernel-doc:: drivers/of/property.c
+   :export:
+
+.. kernel-doc:: include/linux/of_graph.h
+   :internal:
+
+.. kernel-doc:: drivers/of/address.c
+   :export:
+
+.. kernel-doc:: drivers/of/irq.c
+   :export:
+
+.. kernel-doc:: drivers/of/fdt.c
+   :export:
+
+Driver model functions
+----------------------
+
+.. kernel-doc:: include/linux/of_device.h
+   :internal:
+
+.. kernel-doc:: drivers/of/device.c
+   :export:
+
+.. kernel-doc:: include/linux/of_platform.h
+   :internal:
+
+.. kernel-doc:: drivers/of/platform.c
+   :export:
+
+Overlay and Dynamic DT functions
+--------------------------------
+
+.. kernel-doc:: drivers/of/resolver.c
+   :export:
+
+.. kernel-doc:: drivers/of/dynamic.c
+   :export:
+
+.. kernel-doc:: drivers/of/overlay.c
+   :export: