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, 68 insertions, 0 deletions

diff --git a/Documentation/admin-guide/ufs.rst b/Documentation/admin-guide/ufs.rst
new file mode 100644
index 000000000..55d15297f
--- /dev/null
+++ b/Documentation/admin-guide/ufs.rst
@@ -0,0 +1,68 @@
+=========
+Using UFS
+=========
+
+mount -t ufs -o ufstype=type_of_ufs device dir
+
+
+UFS Options
+===========
+
+ufstype=type_of_ufs
+	UFS is a file system widely used in different operating systems.
+	The problem are differences among implementations. Features of
+	some implementations are undocumented, so its hard to recognize
+	type of ufs automatically. That's why user must specify type of
+	ufs manually by mount option ufstype. Possible values are:
+
+	old
+                old format of ufs
+		default value, supported as read-only
+
+	44bsd
+                used in FreeBSD, NetBSD, OpenBSD
+		supported as read-write
+
+	ufs2
+                used in FreeBSD 5.x
+		supported as read-write
+
+	5xbsd
+                synonym for ufs2
+
+	sun
+                used in SunOS (Solaris)
+		supported as read-write
+
+	sunx86
+                used in SunOS for Intel (Solarisx86)
+		supported as read-write
+
+	hp
+                used in HP-UX
+		supported as read-only
+
+	nextstep
+		used in NextStep
+		supported as read-only
+
+	nextstep-cd
+		used for NextStep CDROMs (block_size == 2048)
+		supported as read-only
+
+	openstep
+		used in OpenStep
+		supported as read-only
+
+
+Possible Problems
+-----------------
+
+See next section, if you have any.
+
+
+Bug Reports
+-----------
+
+Any ufs bug report you can send to daniel.pirkl@email.cz or
+to dushistov@mail.ru (do not send partition tables bug reports).