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/tools/perf/util/mem-info.h b/tools/perf/util/mem-info.h
new file mode 100644
index 000000000..df75e94ed
--- /dev/null
+++ b/tools/perf/util/mem-info.h
@@ -0,0 +1,55 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __PERF_MEM_INFO_H
+#define __PERF_MEM_INFO_H
+
+#include <linux/refcount.h>
+#include <linux/perf_event.h>
+#include <internal/rc_check.h>
+#include "map_symbol.h"
+
+DECLARE_RC_STRUCT(mem_info) {
+	struct addr_map_symbol	iaddr;
+	struct addr_map_symbol	daddr;
+	union perf_mem_data_src	data_src;
+	refcount_t		refcnt;
+};
+
+struct mem_info *mem_info__new(void);
+struct mem_info *mem_info__clone(struct mem_info *mi);
+struct mem_info *mem_info__get(struct mem_info *mi);
+void   mem_info__put(struct mem_info *mi);
+
+static inline void __mem_info__zput(struct mem_info **mi)
+{
+	mem_info__put(*mi);
+	*mi = NULL;
+}
+
+#define mem_info__zput(mi) __mem_info__zput(&mi)
+
+static inline struct addr_map_symbol *mem_info__iaddr(struct mem_info *mi)
+{
+	return &RC_CHK_ACCESS(mi)->iaddr;
+}
+
+static inline struct addr_map_symbol *mem_info__daddr(struct mem_info *mi)
+{
+	return &RC_CHK_ACCESS(mi)->daddr;
+}
+
+static inline union perf_mem_data_src *mem_info__data_src(struct mem_info *mi)
+{
+	return &RC_CHK_ACCESS(mi)->data_src;
+}
+
+static inline const union perf_mem_data_src *mem_info__const_data_src(const struct mem_info *mi)
+{
+	return &RC_CHK_ACCESS(mi)->data_src;
+}
+
+static inline refcount_t *mem_info__refcnt(struct mem_info *mi)
+{
+	return &RC_CHK_ACCESS(mi)->refcnt;
+}
+
+#endif /* __PERF_MEM_INFO_H */