[PATCH 05/20] perf test: event_update: fix memory leak of unit

From: Riccardo Mancini <rickyman7@gmail.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Ian Rogers <irogers@google.com>,
	Namhyung Kim <namhyung@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Mark Rutland <mark.rutland@arm.com>, Jiri Olsa <jolsa@redhat.com>,
	linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
	Riccardo Mancini <rickyman7@gmail.com>
Subject: [PATCH 05/20] perf test: event_update: fix memory leak of unit
Date: Thu, 15 Jul 2021 18:07:10 +0200	[thread overview]
Message-ID: <1fbc8158663fb0d4d5392e36bae564f6ad60be3c.1626343282.git.rickyman7@gmail.com> (raw)
In-Reply-To: <cover.1626343282.git.rickyman7@gmail.com>

ASan reports a memory leak while running the perf test
"49: Synthesize attr update" caused by a string being duplicated but
never freed.

This patch adds the missing free().

Note that evsel->unit is not deallocated together with evsel since it
is supposed to be a constant string.

Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
---
 tools/perf/tests/event_update.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tools/perf/tests/event_update.c b/tools/perf/tests/event_update.c
index 932ab0740d11ced6..44a50527f9d95170 100644
--- a/tools/perf/tests/event_update.c
+++ b/tools/perf/tests/event_update.c
@@ -88,6 +88,7 @@ int test__event_update(struct test *test __maybe_unused, int subtest __maybe_unu
 	struct evsel *evsel;
 	struct event_name tmp;
 	struct evlist *evlist = evlist__new_default();
+	char *unit = strdup("KRAVA");
 
 	TEST_ASSERT_VAL("failed to get evlist", evlist);
 
@@ -98,7 +99,7 @@ int test__event_update(struct test *test __maybe_unused, int subtest __maybe_unu
 
 	perf_evlist__id_add(&evlist->core, &evsel->core, 0, 0, 123);
 
-	evsel->unit = strdup("KRAVA");
+	evsel->unit = unit;
 
 	TEST_ASSERT_VAL("failed to synthesize attr update unit",
 			!perf_event__synthesize_event_update_unit(NULL, evsel, process_event_unit));
@@ -118,6 +119,7 @@ int test__event_update(struct test *test __maybe_unused, int subtest __maybe_unu
 	TEST_ASSERT_VAL("failed to synthesize attr update cpus",
 			!perf_event__synthesize_event_update_cpus(&tmp.tool, evsel, process_event_cpus));
 
+	free(unit);
 	evlist__delete(evlist);
 	return 0;
 }
-- 
2.31.1

