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/perf/util/c2c.c b/tools/perf/util/c2c.c
new file mode 100644
index 000000000..58c7342df
--- /dev/null
+++ b/tools/perf/util/c2c.c
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdlib.h>
+#include <linux/kernel.h>
+#include "hist.h"
+#include "c2c.h"
+
+void c2c_fmt_free(struct perf_hpp_fmt *fmt)
+{
+	struct c2c_fmt *c2c_fmt;
+
+	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
+	free(c2c_fmt);
+}
+
+bool c2c_fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
+{
+	struct c2c_fmt *c2c_a = container_of(a, struct c2c_fmt, fmt);
+	struct c2c_fmt *c2c_b = container_of(b, struct c2c_fmt, fmt);
+
+	return c2c_a->dim == c2c_b->dim;
+}