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, 36 insertions, 0 deletions

diff --git a/Documentation/gpu/nova/index.rst b/Documentation/gpu/nova/index.rst
new file mode 100644
index 000000000..2afa58e8f
--- /dev/null
+++ b/Documentation/gpu/nova/index.rst
@@ -0,0 +1,36 @@
+.. SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+=======================
+nova NVIDIA GPU drivers
+=======================
+
+The nova driver project consists out of two separate drivers nova-core and
+nova-drm and intends to supersede the nouveau driver for NVIDIA GPUs based on
+the GPU System Processor (GSP).
+
+The following documents apply to both nova-core and nova-drm.
+
+.. toctree::
+   :titlesonly:
+
+   guidelines
+
+nova-core
+=========
+
+The nova-core driver is the core driver for NVIDIA GPUs based on GSP. nova-core,
+as the 1st level driver, provides an abstraction around the GPUs hard- and
+firmware interfaces providing a common base for 2nd level drivers, such as the
+vGPU manager VFIO driver and the nova-drm driver.
+
+.. toctree::
+   :titlesonly:
+
+   core/guidelines
+   core/todo
+   core/vbios
+   core/devinit
+   core/fsp
+   core/fwsec
+   core/falcon
+   core/tlv