[PATCH v2 1/6] perf stat: Avoid segv if core.user_cpus isn't set.

[Ian Rogers]

Passing null to perf_cpu_map__max doesn't make sense as there is no
valid max. Avoid this problem by null checking in
perf_stat_init_aggr_mode.

Signed-off-by: Ian Rogers <irogers at google.com>
---
 tools/perf/builtin-stat.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 4ee40de698a4..b81ae5053218 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1472,7 +1472,10 @@ static int perf_stat_init_aggr_mode(void)
 	 * taking the highest cpu number to be the size of
 	 * the aggregation translate cpumap.
 	 */
-	nr = perf_cpu_map__max(evsel_list->core.cpus).cpu;
+	if (evsel_list->core.cpus)
+		nr = perf_cpu_map__max(evsel_list->core.cpus).cpu;
+	else
+		nr = 0;
 	stat_config.cpus_aggr_map = cpu_aggr_map__empty_new(nr + 1);
 	return stat_config.cpus_aggr_map ? 0 : -ENOMEM;
 }
-- 
2.35.1.1021.g381101b075-goog