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-rw-r--r--tools/perf/util/cpumap.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 3acfbe34ebaf..39cce66b4ebc 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -751,7 +751,10 @@ size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
unsigned char *bitmap;
int last_cpu = cpu_map__cpu(map, map->nr - 1);
- bitmap = zalloc((last_cpu + 7) / 8);
+ if (buf == NULL)
+ return 0;
+
+ bitmap = zalloc(last_cpu / 8 + 1);
if (bitmap == NULL) {
buf[0] = '\0';
return 0;