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, 101 insertions, 0 deletions

diff --git a/drivers/reset/reset-imx-scu.c b/drivers/reset/reset-imx-scu.c
new file mode 100644
index 000000000..919fc29f9
--- /dev/null
+++ b/drivers/reset/reset-imx-scu.c
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2025 NXP
+ * Frank Li <Frank.Li@nxp.com>
+ */
+#include <linux/firmware/imx/svc/misc.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/reset-controller.h>
+
+#include <dt-bindings/firmware/imx/rsrc.h>
+
+struct imx_scu_reset {
+	struct reset_controller_dev rc;
+	struct imx_sc_ipc *ipc_handle;
+};
+
+static struct imx_scu_reset *to_imx_scu(struct reset_controller_dev *rc)
+{
+	return container_of(rc, struct imx_scu_reset, rc);
+}
+
+struct imx_scu_id_map {
+	u32 resource_id;
+	u32 command_id;
+};
+
+static const struct imx_scu_id_map imx_scu_id_map[] = {
+	{ IMX_SC_R_CSI_0, IMX_SC_C_MIPI_RESET },
+	{ IMX_SC_R_CSI_1, IMX_SC_C_MIPI_RESET },
+};
+
+static int imx_scu_reset_assert(struct reset_controller_dev *rc, unsigned long id)
+{
+	struct imx_scu_reset *priv = to_imx_scu(rc);
+
+	return imx_sc_misc_set_control(priv->ipc_handle, imx_scu_id_map[id].resource_id,
+				       imx_scu_id_map[id].command_id, true);
+}
+
+static const struct reset_control_ops imx_scu_reset_ops = {
+	.assert = imx_scu_reset_assert,
+};
+
+static int imx_scu_xlate(struct reset_controller_dev *rc, const struct of_phandle_args *reset_spec)
+{
+	int i;
+
+	for (i = 0; i < rc->nr_resets; i++)
+		if (reset_spec->args[0] == imx_scu_id_map[i].resource_id)
+			return i;
+
+	return -EINVAL;
+}
+
+static int imx_scu_reset_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct imx_scu_reset *priv;
+	int ret;
+
+	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, &priv->rc);
+
+	ret = imx_scu_get_handle(&priv->ipc_handle);
+	if (ret)
+		return dev_err_probe(dev, ret, "sc_misc_MIPI get ipc handle failed!\n");
+
+	priv->rc.ops = &imx_scu_reset_ops;
+	priv->rc.owner = THIS_MODULE;
+	priv->rc.of_node = dev->of_node;
+	priv->rc.of_reset_n_cells = 1;
+	priv->rc.of_xlate = imx_scu_xlate;
+	priv->rc.nr_resets = ARRAY_SIZE(imx_scu_id_map);
+
+	return devm_reset_controller_register(dev, &priv->rc);
+}
+
+static const struct of_device_id imx_scu_reset_ids[] = {
+	{ .compatible = "fsl,imx-scu-reset", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, imx_scu_reset_ids);
+
+static struct platform_driver imx_scu_reset_driver = {
+	.probe          = imx_scu_reset_probe,
+	.driver = {
+		.name = "scu-reset",
+		.of_match_table = imx_scu_reset_ids,
+	},
+};
+module_platform_driver(imx_scu_reset_driver);
+
+MODULE_AUTHOR("Frank Li <Frank.Li@nxp.com>");
+MODULE_DESCRIPTION("i.MX scu reset driver");
+MODULE_LICENSE("GPL");