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, 62 insertions, 0 deletions

diff --git a/tools/docs/find-unused-docs.sh b/tools/docs/find-unused-docs.sh
new file mode 100755
index 000000000..53514c759
--- /dev/null
+++ b/tools/docs/find-unused-docs.sh
@@ -0,0 +1,62 @@
+#!/bin/bash
+# (c) 2017, Jonathan Corbet <corbet@lwn.net>
+#           sayli karnik <karniksayli1995@gmail.com>
+#
+# This script detects files with kernel-doc comments for exported functions
+# that are not included in documentation.
+#
+# usage: Run 'tools/docs/find-unused-docs.sh directory' from top level of kernel
+# 	 tree.
+#
+# example: $tools/docs/find-unused-docs.sh drivers/scsi
+#
+# Licensed under the terms of the GNU GPL License
+
+if ! [ -d "Documentation" ]; then
+	echo "Run from top level of kernel tree"
+	exit 1
+fi
+
+if [ "$#" -ne 1 ]; then
+	echo "Usage: tools/docs/find-unused-docs.sh directory"
+	exit 1
+fi
+
+if ! [ -d "$1" ]; then
+	echo "Directory $1 doesn't exist"
+	exit 1
+fi
+
+cd "$( dirname "${BASH_SOURCE[0]}" )"
+cd ../..
+
+cd Documentation/
+
+echo "The following files contain kerneldoc comments for exported functions \
+that are not used in the formatted documentation"
+
+# FILES INCLUDED
+
+files_included=($(grep -rHR ".. kernel-doc" --include \*.rst | cut -d " " -f 3))
+
+declare -A FILES_INCLUDED
+
+for each in "${files_included[@]}"; do
+	FILES_INCLUDED[$each]="$each"
+	done
+
+cd ..
+
+# FILES NOT INCLUDED
+
+for file in `find $1 -name '*.c'`; do
+
+	if [[ ${FILES_INCLUDED[$file]+_} ]]; then
+	continue;
+	fi
+	str=$(PYTHONDONTWRITEBYTECODE=1 tools/docs/kernel-doc -export "$file" 2>/dev/null)
+	if [[ -n "$str" ]]; then
+	echo "$file"
+	fi
+	done
+