linux-kernel - Re: [PATCH 1/3] perf stat: Check return value of asprintf() properly

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Date:   Thu, 3 Jun 2021 21:47:58 -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 <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: Re: [PATCH 1/3] perf stat: Check return value of asprintf() properly

On Wed, Jun 2, 2021 at 2:22 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> It returns -1 on error, so checking with 0 would not work.
>
> Fixes: 12279429d862 ("perf stat: Uniquify hybrid event name")
> Cc: Jin Yao <yao.jin@...ux.intel.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

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

Thanks,
Ian

> ---
>  tools/perf/util/stat-display.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
> index b759dfd633b4..04afd41b6067 100644
> --- a/tools/perf/util/stat-display.c
> +++ b/tools/perf/util/stat-display.c
> @@ -564,7 +564,7 @@ static void uniquify_event_name(struct evsel *counter)
>                                        counter->name, counter->pmu_name);
>                 }
>
> -               if (ret) {
> +               if (ret > 0) {
>                         free(counter->name);
>                         counter->name = new_name;
>                 }
> --
> 2.32.0.rc0.204.g9fa02ecfa5-goog
>