linux-kernel - Re: [PATCH 05/20] perf test: event

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Date:   Thu, 15 Jul 2021 16:58:31 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Riccardo Mancini <rickyman7@...il.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 05/20] perf test: event_update: fix memory leak of unit

Em Thu, Jul 15, 2021 at 06:07:10PM +0200, Riccardo Mancini escreveu:
> 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.

Thanks, applied and added the Fixes tag, which I'm doing to all the
patches in the series.

- Arnaldo

 
> Signed-off-by: Riccardo Mancini <rickyman7@...il.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
> 

-- 

- Arnaldo