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, 48 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/siox/eckelmann,siox-gpio.yaml b/Documentation/devicetree/bindings/siox/eckelmann,siox-gpio.yaml
new file mode 100644
index 000000000..2ff204109
--- /dev/null
+++ b/Documentation/devicetree/bindings/siox/eckelmann,siox-gpio.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/siox/eckelmann,siox-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Eckelmann SIOX GPIO bus
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    const: eckelmann,siox-gpio
+
+  din-gpios:
+    maxItems: 1
+
+  dout-gpios:
+    maxItems: 1
+
+  dclk-gpios:
+    maxItems: 1
+
+  dld-gpios:
+    maxItems: 1
+
+required:
+  - compatible
+  - din-gpios
+  - dout-gpios
+  - dclk-gpios
+  - dld-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    siox {
+        compatible = "eckelmann,siox-gpio";
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_siox>;
+
+        din-gpios = <&gpio6 11 0>;
+        dout-gpios = <&gpio6 8 0>;
+        dclk-gpios = <&gpio6 9 0>;
+        dld-gpios = <&gpio6 10 0>;
+    };