linux-kernel - Re: [PATCH v1] perf metrics: Avoid segv with --topdown

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Date:   Tue, 16 May 2023 13:14:01 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf metrics: Avoid segv with --topdown



On 2023-05-15 6:45 p.m., Ian Rogers wrote:
> Some metrics may not have a metric_group which can result in segvs
> with "perf stat --topdown". Add a condition for the no metric_group
> case.
> 
> Fixes: 1647cd5b8802 ("perf stat: Implement --topdown using json metrics")
> Reported-by: Kan Liang <kan.liang@...ux.intel.com>
> Signed-off-by: Ian Rogers <irogers@...gle.com>

Tested-by: Kan Liang <kan.liang@...ux.intel.com>

Thanks,
Kan

> ---
>  tools/perf/util/metricgroup.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index 4e7d41d285b4..5e9c657dd3f7 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -1672,7 +1672,7 @@ static int metricgroup__topdown_max_level_callback(const struct pmu_metric *pm,
>  {
>  	unsigned int *max_level = data;
>  	unsigned int level;
> -	const char *p = strstr(pm->metric_group, "TopdownL");
> +	const char *p = strstr(pm->metric_group ?: "", "TopdownL");
>  
>  	if (!p || p[8] == '\0')
>  		return 0;