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, 72 insertions, 0 deletions

diff --git a/tools/crypto/ccp/dbc.c b/tools/crypto/ccp/dbc.c
new file mode 100644
index 000000000..80248d3d3
--- /dev/null
+++ b/tools/crypto/ccp/dbc.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Secure Processor Dynamic Boost Control sample library
+ *
+ * Copyright (C) 2023 Advanced Micro Devices, Inc.
+ *
+ * Author: Mario Limonciello <mario.limonciello@amd.com>
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+/* if uapi header isn't installed, this might not yet exist */
+#ifndef __packed
+#define __packed __attribute__((packed))
+#endif
+#include <linux/psp-dbc.h>
+
+int get_nonce(int fd, void *nonce_out, void *signature)
+{
+	struct dbc_user_nonce tmp = {
+		.auth_needed = !!signature,
+	};
+
+	assert(nonce_out);
+
+	if (signature)
+		memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+	if (ioctl(fd, DBCIOCNONCE, &tmp))
+		return errno;
+	memcpy(nonce_out, tmp.nonce, sizeof(tmp.nonce));
+
+	return 0;
+}
+
+int set_uid(int fd, __u8 *uid, __u8 *signature)
+{
+	struct dbc_user_setuid tmp;
+
+	assert(uid);
+	assert(signature);
+
+	memcpy(tmp.uid, uid, sizeof(tmp.uid));
+	memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+	if (ioctl(fd, DBCIOCUID, &tmp))
+		return errno;
+	return 0;
+}
+
+int process_param(int fd, int msg_index, __u8 *signature, int *data)
+{
+	struct dbc_user_param tmp = {
+		.msg_index = msg_index,
+		.param = *data,
+	};
+
+	assert(signature);
+	assert(data);
+
+	memcpy(tmp.signature, signature, sizeof(tmp.signature));
+
+	if (ioctl(fd, DBCIOCPARAM, &tmp))
+		return errno;
+
+	*data = tmp.param;
+	memcpy(signature, tmp.signature, sizeof(tmp.signature));
+	return 0;
+}