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

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Date:   Mon, 15 May 2023 15:45:30 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     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>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH v1] perf metrics: Avoid segv with --topdown

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>
---
 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;
-- 
2.40.1.606.ga4b1b128d6-goog