diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 4805e6dfd23..08b6759287f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -187,7 +187,9 @@ static int do_write(int fd, const void *buf, size_t size)
 
 static int __dsos__write_buildid_table(struct list_head *head, int fd)
 {
+#define NAME_ALIGN	64
 	struct dso *pos;
+	static const char zero_buf[NAME_ALIGN];
 
 	list_for_each_entry(pos, head, node) {
 		int err;
@@ -197,14 +199,17 @@ static int __dsos__write_buildid_table(struct list_head *head, int fd)
 		if (!pos->has_build_id)
 			continue;
 		len = pos->long_name_len + 1;
-		len = ALIGN(len, 64);
+		len = ALIGN(len, NAME_ALIGN);
 		memset(&b, 0, sizeof(b));
 		memcpy(&b.build_id, pos->build_id, sizeof(pos->build_id));
 		b.header.size = sizeof(b) + len;
 		err = do_write(fd, &b, sizeof(b));
 		if (err < 0)
 			return err;
-		err = do_write(fd, pos->long_name, len);
+		err = do_write(fd, pos->long_name, pos->long_name_len + 1);
+		if (err < 0)
+			return err;
+		err = do_write(fd, zero_buf, len - pos->long_name_len + 1);
 		if (err < 0)
 			return err;
 	}
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 0302405aa2c..6ffe9d63d85 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -177,7 +177,7 @@ void parse_proc_kallsyms(char *file, unsigned int size __unused)
 		func_count++;
 	}
 
-	func_list = malloc_or_die(sizeof(*func_list) * func_count + 1);
+	func_list = malloc_or_die(sizeof(*func_list) * (func_count + 1));
 
 	i = 0;
 	while (list) {
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 342dfdd43f8..1744422cafc 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -145,8 +145,9 @@ static void read_proc_kallsyms(void)
 	if (!size)
 		return;
 
-	buf = malloc_or_die(size);
+	buf = malloc_or_die(size + 1);
 	read_or_die(buf, size);
+	buf[size] = '\0';
 
 	parse_proc_kallsyms(buf, size);