linux-kernel - [PATCH v2 2/7] perf test demangle-java: Don't segv if demangling fails

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Message-ID: <20250528032637.198960-3-irogers@google.com>
Date: Tue, 27 May 2025 20:26:32 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Miguel Ojeda <ojeda@...nel.org>, 
	Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, 
	Gary Guo <gary@...yguo.net>, 
	"Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, 
	Jiapeng Chong <jiapeng.chong@...ux.alibaba.com>, James Clark <james.clark@...aro.org>, 
	Howard Chu <howardchu95@...il.com>, Weilin Wang <weilin.wang@...el.com>, 
	Stephen Brennan <stephen.s.brennan@...cle.com>, Andi Kleen <ak@...ux.intel.com>, 
	Dmitry Vyukov <dvyukov@...gle.com>, linux-perf-users@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/7] perf test demangle-java: Don't segv if demangling fails

The buffer returned by dso__demangle_sym may be NULL, don't segv in
strcmp if this happens. Currently this happens for NO_LIBELF=1 builds.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/tests/demangle-java-test.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/tests/demangle-java-test.c b/tools/perf/tests/demangle-java-test.c
index ebaf60cdfa99..0fb3e5a4a0ed 100644
--- a/tools/perf/tests/demangle-java-test.c
+++ b/tools/perf/tests/demangle-java-test.c
@@ -30,6 +30,11 @@ static int test__demangle_java(struct test_suite *test __maybe_unused, int subte
 
 	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);
-- 
2.49.0.1238.gf8c92423fb-goog