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, 30 insertions, 0 deletions

diff --git a/Documentation/misc-devices/index.rst b/Documentation/misc-devices/index.rst
new file mode 100644
index 000000000..f911edaec
--- /dev/null
+++ b/Documentation/misc-devices/index.rst
@@ -0,0 +1,30 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+============================================
+Assorted Miscellaneous Devices Documentation
+============================================
+
+This documentation contains information for assorted devices that do not
+fit into other categories.
+
+.. toctree::
+   :caption: Table of contents
+   :maxdepth: 2
+
+   ad525x_dpot
+   amd-sbi
+   bh1770glc
+   c2port
+   dw-xdata-pcie
+   ibmvmc
+   ics932s401
+   isl29003
+   lis3lv02d
+   max6875
+   mrvl_cn10k_dpi
+   oxsemi-tornado
+   pci-endpoint-test
+   spear-pcie-gadget
+   tps6594-pfsm
+   uacce
+   xilinx_sdfec