linux-kernel - Re: [PATCH] perf metric: Fix some memory leaks

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Message-ID: <CAP-5=fXjeCBemNivMb6+9AH-PETTqTghaZHniOohd_1ms1rU2A@mail.gmail.com>
Date:   Thu, 3 Sep 2020 21:02:38 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <andi@...stfloor.org>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>
Subject: Re: [PATCH] perf metric: Fix some memory leaks

On Thu, Sep 3, 2020 at 8:21 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> I found some memory leaks while reading the metric code.  Some are
> real and others only occur in the error path.

Thanks Namhyung! Is it possible to get test coverage?
Ian

> Cc: Kajol Jain <kjain@...ux.ibm.com>
> Cc: John Garry <john.garry@...wei.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Fixes: 9afe5658a6fa8 ("perf tools: Release metric_events rblist")
> Fixes: 4ea2896715e67 ("perf metric: Collect referenced metrics in struct metric_expr")
> Fixes: 71b0acce78d12 ("perf list: Add metric groups to perf list")
> Fixes: b18f3e365019d ("perf stat: Support JSON metrics in perf stat")
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> I'm not sure it'd better have them together or split each fix as
> they came from different commits.  Please let me know if you prefer
> split.
>
>  tools/perf/util/metricgroup.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 8831b964288f..7e31c4578ce8 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -85,6 +85,7 @@ static void metric_event_delete(struct rblist *rblist __maybe_unused,
>
>         list_for_each_entry_safe(expr, tmp, &me->head, nd) {
>                 free(expr->metric_refs);
> +               free(expr->metric_events);
>                 free(expr);
>         }
>
> @@ -316,6 +317,7 @@ static int metricgroup__setup_events(struct list_head *groups,
>                         if (!metric_refs) {
>                                 ret = -ENOMEM;
>                                 free(metric_events);
> +                               free(expr);
>                                 break;
>                         }
>
> @@ -530,6 +532,9 @@ void metricgroup__print(bool metrics, bool metricgroups, char *filter,
>                                                 continue;
>                                         strlist__add(me->metrics, s);
>                                 }
> +
> +                               if (!raw)
> +                                       free(s);
>                         }
>                         free(omg);
>                 }
> @@ -1048,11 +1053,11 @@ static int parse_groups(struct evlist *perf_evlist, const char *str,
>                 parse_events_print_error(&parse_error, extra_events.buf);
>                 goto out;
>         }
> -       strbuf_release(&extra_events);
>         ret = metricgroup__setup_events(&metric_list, metric_no_merge,
>                                         perf_evlist, metric_events);
>  out:
>         metricgroup__free_metrics(&metric_list);
> +       strbuf_release(&extra_events);
>         return ret;
>  }
>
> --
> 2.28.0.526.ge36021eeef-goog
>