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, 32 insertions, 0 deletions

diff --git a/tools/perf/util/unwind-libdw.h b/tools/perf/util/unwind-libdw.h
new file mode 100644
index 000000000..6423bf5a2
--- /dev/null
+++ b/tools/perf/util/unwind-libdw.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_UNWIND_LIBDW_H
+#define __PERF_UNWIND_LIBDW_H
+
+#include <stdint.h>
+#include "unwind.h"
+
+struct machine;
+struct perf_sample;
+struct thread;
+
+#ifdef HAVE_LIBDW_SUPPORT
+
+struct unwind_info {
+	void			*dwfl;
+	struct perf_sample      *sample;
+	struct machine          *machine;
+	struct thread           *thread;
+	unwind_entry_cb_t	cb;
+	void			*arg;
+	int			max_stack;
+	int			idx;
+	uint32_t		e_flags;
+	uint16_t		e_machine;
+	bool			best_effort;
+	struct unwind_entry	entries[];
+};
+
+void libdw__invalidate_dwfl(struct maps *maps, void *dwfl);
+#endif
+
+#endif /* __PERF_UNWIND_LIBDW_H */