[RFC PATCH 24/25] perf stat: Add check to ensure correctness in platform that does not support hardware-grouping

[weilin . wang]

From: Weilin Wang <weilin.wang@xxxxxxxxx>

Add check and return with -EINVAL when event json files do not support
hardware aware grouping so that the program could successfully fall back to
normal grouping without segfault.

Signed-off-by: Weilin Wang <weilin.wang@xxxxxxxxx>
---
 tools/perf/util/metricgroup.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
index 6a4404226..1c89c9371 100644
--- a/tools/perf/util/metricgroup.c
+++ b/tools/perf/util/metricgroup.c
@@ -1684,6 +1684,8 @@ static int metricgroup__add_metric_event_callback(const struct pmu_event *pe,
 	struct metricgroup__add_metric_event_data *d = data;
 
 	if (!strcasecmp(pe->name, d->event_name)) {
+		if (!pe->counter)
+			return -EINVAL;
 		event = event_info__new(d->event_id, pe->pmu, pe->counter,
 					pe->taken_alone, /*free_counter=*/false);
 		if (!event)
-- 
2.39.3