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, 21 insertions, 0 deletions

diff --git a/tools/include/nolibc/byteswap.h b/tools/include/nolibc/byteswap.h
new file mode 100644
index 000000000..45bbf9609
--- /dev/null
+++ b/tools/include/nolibc/byteswap.h
@@ -0,0 +1,21 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * Byte swapping for NOLIBC
+ * Copyright (C) 2026 Thomas Weißschuh <linux@weissschuh.net>
+ */
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#ifndef _NOLIBC_BYTESWAP_H
+#define _NOLIBC_BYTESWAP_H
+
+#include "stdint.h"
+
+#include <linux/swab.h>
+
+#define bswap_16(_x) __swab16(_x)
+#define bswap_32(_x) __swab32(_x)
+#define bswap_64(_x) __swab64(_x)
+
+#endif /* _NOLIBC_BYTESWAP_H */