check invalid topology

src/freebsd/topology.c

@@ -84,23 +84,27 @@ struct cpuinfo_freebsd_topology cpuinfo_freebsd_detect_topology(void) {
 		cpuinfo_log_error("failed to parse topology_spec:%s",
 				  topology_spec);
 		free(topology_spec);
-		return topology;
+		goto fail;
 	}
 	free(topology_spec);
 	topology.cores = sysctl_int("kern.smp.cores");
 	if (topology.cores == 0) {
-		topology.packages = 0;
-		return topology;
+		goto fail;
+	}
+	if (topology.cores < topology.packages) {
+		goto fail;
 	}
 	topology.threads_per_core = sysctl_int("kern.smp.threads_per_core");
 	if (topology.threads_per_core == 0) {
-		topology.packages = 0;
-		return topology;
+		goto fail;
 	}
 	cpuinfo_log_debug("freebsd topology: packages = %d, cores = %d, "
 			  "threads_per_core = %d",
 			  topology.packages, topology.cores,
 			  topology.threads_per_core);
 	topology.threads = topology.threads_per_core * topology.cores;
 	return topology;
+fail:
+	topology.packages = 0;
+	return topology;
 }