diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 9a15dd4b7640..eefd1cd73b6a 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -3634,6 +3634,7 @@ static int process_cpu_domain_info(struct feat_fd *ff, void *data __maybe_unused
 			if (!d_info)
 				return -1;
 
+			assert(cd_map[cpu]->domains[domain] == NULL);
 			cd_map[cpu]->domains[domain] = d_info;
 			d_info->domain = domain;
 
@@ -3642,30 +3643,20 @@ static int process_cpu_domain_info(struct feat_fd *ff, void *data __maybe_unused
 				if (!dname)
 					return -1;
 
-				d_info->dname = zalloc(strlen(dname) + 1);
-				if (!d_info->dname)
-					return -1;
-
-				d_info->dname = strdup(dname);
+				d_info->dname = dname;
 			}
 
 			cpumask = do_read_string(ff);
 			if (!cpumask)
 				return -1;
 
-			d_info->cpumask = zalloc(strlen(cpumask) + 1);
-			if (!d_info->cpumask)
-				return -1;
-			d_info->cpumask = strdup(cpumask);
+			d_info->cpumask = cpumask;
 
 			cpulist = do_read_string(ff);
 			if (!cpulist)
 				return -1;
 
-			d_info->cpulist = zalloc(strlen(cpulist) + 1);
-			if (!d_info->cpulist)
-				return -1;
-			d_info->cpulist = strdup(cpulist);
+			d_info->cpulist = cpulist;
 		}
 	}