6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ian Rogers <irogers@xxxxxxxxxx>
commit e2b005d6ec0e738df584190e21d2c7ada37266a0 upstream.
A metric is default by having "Default" within its groups. The default
metricgroup name needn't be set and this can result in segv in
default_metricgroup_cmp and perf_stat__print_shadow_stats_metricgroup
that assume it has a value when there is a Default metric group. To
avoid the segv initialize the value to "".
Fixes: 1c0e47956a8e ("perf metrics: Sort the Default metricgroup")
Signed-off-by: Ian Rogers <irogers@xxxxxxxxxx>
Reviewed-and-tested-by: Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Leo Yan <leo.yan@xxxxxxxxxx>
Cc: Mike Leach <mike.leach@xxxxxxxxxx>
Cc: Kajol Jain <kjain@xxxxxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Cc: John Garry <john.g.garry@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20231204182330.654255-1-irogers@xxxxxxxxxx
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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 0484736d9fe4..ca3e0404f187 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -225,7 +225,7 @@ static struct metric *metric__new(const struct pmu_metric *pm,
m->pmu = pm->pmu ?: "cpu";
m->metric_name = pm->metric_name;
- m->default_metricgroup_name = pm->default_metricgroup_name;
+ m->default_metricgroup_name = pm->default_metricgroup_name ?: "";
m->modifier = NULL;
if (modifier) {
m->modifier = strdup(modifier);
--
2.43.0
