linux-kernel - Re: [PATCH 1/4] perf metrictroup: Fix memory leak of metric

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Date:   Thu, 21 May 2020 09:10:55 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Wei Li <liwei391@...wei.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Li Bin <huawei.libin@...wei.com>,
        Xie XiuQi <xiexiuqi@...wei.com>,
        Hongbo Yao <yaohongbo@...wei.com>
Subject: Re: [PATCH 1/4] perf metrictroup: Fix memory leak of metric_events

On Thu, May 21, 2020 at 8:54 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Thu, May 21, 2020 at 09:32:15PM +0800, Wei Li escreveu:
> > From: Hongbo Yao <yaohongbo@...wei.com>
> >
> > Fix memory leak of metric_events in function metricgroup__setup_events()
>
> The leak is there but this code has changed a lot recently, please take
> a look at my perf/core branch and keep Ian Rogers in the loop,
>
> - Arnaldo

Thanks, I'd posted the same change here:
https://lore.kernel.org/lkml/20200508053629.210324-10-irogers@google.com/
but it looks like it was mislaid. Arnaldo, I can re-post that patch or
Acked-by this patch. I'm easy either way.

Thanks,
Ian

> > Signed-off-by: Hongbo Yao <yaohongbo@...wei.com>
> > ---
> >  tools/perf/util/metricgroup.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> > index 926449a7cdbf..69bf0f4d646e 100644
> > --- a/tools/perf/util/metricgroup.c
> > +++ b/tools/perf/util/metricgroup.c
> > @@ -184,6 +184,7 @@ static int metricgroup__setup_events(struct list_head *groups,
> >               if (!evsel) {
> >                       pr_debug("Cannot resolve %s: %s\n",
> >                                       eg->metric_name, eg->metric_expr);
> > +                     free(metric_events);
> >                       continue;
> >               }
> >               for (i = 0; i < eg->idnum; i++)
> > @@ -191,11 +192,13 @@ static int metricgroup__setup_events(struct list_head *groups,
> >               me = metricgroup__lookup(metric_events_list, evsel, true);
> >               if (!me) {
> >                       ret = -ENOMEM;
> > +                     free(metric_events);
> >                       break;
> >               }
> >               expr = malloc(sizeof(struct metric_expr));
> >               if (!expr) {
> >                       ret = -ENOMEM;
> > +                     free(metric_events);
> >                       break;
> >               }
> >               expr->metric_expr = eg->metric_expr;
> > --
> > 2.17.1
> >
>
> --
>
> - Arnaldo