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, 55 insertions, 0 deletions

diff --git a/drivers/usb/image/microtek.h b/drivers/usb/image/microtek.h
new file mode 100644
index 000000000..7bd5f4639
--- /dev/null
+++ b/drivers/usb/image/microtek.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+ /*
+ * Driver for Microtek Scanmaker X6 USB scanner and possibly others.
+ * 
+ * (C) Copyright 2000 John Fremlin <vii@penguinpowered.com>
+ * (C) Copyright 2000 Oliver Neukum <Oliver.Neukum@lrz.uni-muenchen.de>
+ *
+ * See microtek.c for history
+ *
+ */
+
+typedef void (*mts_scsi_cmnd_callback)(struct scsi_cmnd *);
+
+
+struct mts_transfer_context
+{
+	struct mts_desc *instance;
+	mts_scsi_cmnd_callback final_callback;
+	struct scsi_cmnd *srb;
+	
+	void *data;
+	unsigned data_length;
+	int data_pipe;
+	struct scatterlist *curr_sg;
+
+	u8 *scsi_status; /* status returned from ep_response after command completion */
+};
+
+
+struct mts_desc {
+	struct mts_desc *next;
+	struct mts_desc *prev;
+
+	struct usb_device *usb_dev;
+	struct usb_interface *usb_intf;
+
+	/* Endpoint addresses */
+	u8 ep_out;
+	u8 ep_response;
+	u8 ep_image;
+
+	struct Scsi_Host *host;
+
+	struct urb *urb;
+	struct mts_transfer_context context;
+};
+
+
+#define MTS_EP_OUT	0x1
+#define MTS_EP_RESPONSE	0x2
+#define MTS_EP_IMAGE	0x3
+#define MTS_EP_TOTAL	0x3
+
+#define MTS_SCSI_ERR_MASK ~0x3fu
+