linux-kernel - Re: [PATCH 01/19] perf metric: Fix memory leak in expr__add

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Date:   Sun, 19 Jul 2020 14:41:46 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        John Garry <john.garry@...wei.com>,
        "Paul A. Clarke" <pc@...ibm.com>,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 01/19] perf metric: Fix memory leak in expr__add_id function

On Sun, Jul 19, 2020 at 11:13 AM Jiri Olsa <jolsa@...nel.org> wrote:
>
> Arnaldo found that we don't release value data in case the
> hashmap__set fails. Releasing it in case of an error.
>
> Reported-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Acked-by: Ian Rogers <irogers@...gle.com>

> ---
>  tools/perf/util/expr.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 5d05f9765ed8..578a173d4873 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -47,6 +47,8 @@ int expr__add_id_val(struct expr_parse_ctx *ctx, const char *id, double val)
>         }
>         ret = hashmap__set(&ctx->ids, id, data_ptr,
>                            (const void **)&old_key, (void **)&old_data);
> +       if (ret)
> +               free(data_ptr);
>         free(old_key);
>         free(old_data);
>         return ret;
> --
> 2.25.4
>