diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index b1e5c29c6e3e..d3432622b2ad 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -576,6 +576,10 @@ int cpu__get_node(struct perf_cpu cpu)
 		return -1;
 	}
 
+	/* cpunode_map allocated for max_cpu_num entries; input may be untrusted */
+	if (cpu.cpu < 0 || cpu.cpu >= max_cpu_num.cpu)
+		return -1;
+
 	return cpunode_map[cpu.cpu];
 }