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, 74 insertions, 0 deletions

diff --git a/tools/perf/tests/demangle-rust-v0-test.c b/tools/perf/tests/demangle-rust-v0-test.c
new file mode 100644
index 000000000..904f966c6
--- /dev/null
+++ b/tools/perf/tests/demangle-rust-v0-test.c
@@ -0,0 +1,74 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+#include "tests.h"
+#include "debug.h"
+#include "symbol.h"
+#include <linux/kernel.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int test__demangle_rust(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
+{
+	int ret = TEST_OK;
+	char *buf = NULL;
+	size_t i;
+
+	struct {
+		const char *mangled, *demangled;
+	} test_cases[] = {
+		{ "_RNvMsr_NtCs3ssYzQotkvD_3std4pathNtB5_7PathBuf3newCs15kBYyAo9fc_7mycrate",
+		  "<std::path::PathBuf>::new" },
+		{ "_RNvCs15kBYyAo9fc_7mycrate7example",
+		  "mycrate::example" },
+		{ "_RNvMs_Cs4Cv8Wi1oAIB_7mycrateNtB4_7Example3foo",
+		  "<mycrate::Example>::foo" },
+		{ "_RNvXCs15kBYyAo9fc_7mycrateNtB2_7ExampleNtB2_5Trait3foo",
+		  "<mycrate::Example as mycrate::Trait>::foo" },
+		{ "_RNvMCs7qp2U7fqm6G_7mycrateNtB2_7Example3foo",
+		  "<mycrate::Example>::foo" },
+		{ "_RNvMs_Cs7qp2U7fqm6G_7mycrateNtB4_7Example3bar",
+		  "<mycrate::Example>::bar" },
+		{ "_RNvYNtCs15kBYyAo9fc_7mycrate7ExampleNtB4_5Trait7exampleB4_",
+		  "<mycrate::Example as mycrate::Trait>::example" },
+		{ "_RNCNvCsgStHSCytQ6I_7mycrate4main0B3_",
+		  "mycrate::main::{closure#0}" },
+		{ "_RNCNvCsgStHSCytQ6I_7mycrate4mains_0B3_",
+		  "mycrate::main::{closure#1}" },
+		{ "_RINvCsgStHSCytQ6I_7mycrate7examplelKj1_EB2_",
+		  "mycrate::example::<i32, 1>" },
+		{ "_RINvCs7qp2U7fqm6G_7mycrate7exampleFG0_RL1_hRL0_tEuEB2_",
+		  "mycrate::example::<for<'a, 'b> fn(&'a u8, &'b u16)>",
+		},
+		{ "_RINvCs7qp2U7fqm6G_7mycrate7exampleKy12345678_EB2_",
+		  "mycrate::example::<305419896>" },
+		{ "_RNvNvMCsd9PVOYlP1UU_7mycrateINtB4_7ExamplepKpE3foo14EXAMPLE_STATIC",
+		  "<mycrate::Example<_, _>>::foo::EXAMPLE_STATIC",
+		},
+		{ "_RINvCs7qp2U7fqm6G_7mycrate7exampleAtj8_EB2_",
+		  "mycrate::example::<[u16; 8]>" },
+		{ "_RINvCs7qp2U7fqm6G_7mycrate7exampleNtB2_7ExampleBw_EB2_",
+		  "mycrate::example::<mycrate::Example, mycrate::Example>" },
+		{ "_RINvMsY_NtCseXNvpPnDBDp_3std4pathNtB6_4Path3neweECs7qp2U7fqm6G_7mycrate",
+		  "<std::path::Path>::new::<str>" },
+		{ "_RNvNvNvCs7qp2U7fqm6G_7mycrate7EXAMPLE7___getit5___KEY",
+		  "mycrate::EXAMPLE::__getit::__KEY" },
+	};
+
+	for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
+		buf = dso__demangle_sym(/*dso=*/NULL, /*kmodule=*/0, test_cases[i].mangled);
+		if (!buf) {
+			pr_debug("FAILED to demangle: \"%s\"\n \"%s\"\n", test_cases[i].mangled,
+				 test_cases[i].demangled);
+			continue;
+		}
+		if (strcmp(buf, test_cases[i].demangled)) {
+			pr_debug("FAILED: %s: %s != %s\n", test_cases[i].mangled,
+				 buf, test_cases[i].demangled);
+			ret = TEST_FAIL;
+		}
+		free(buf);
+	}
+
+	return ret;
+}
+
+DEFINE_SUITE("Demangle Rust", demangle_rust);