linux-kernel - [PATCH 2/5] perf sched: Fix memory leak in perf_sched_

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Date: Mon, 5 Feb 2024 10:46:13 +0000
From: Yang Jihong <yangjihong1@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<namhyung@...nel.org>, <mark.rutland@....com>,
	<alexander.shishkin@...ux.intel.com>, <jolsa@...nel.org>,
	<irogers@...gle.com>, <adrian.hunter@...el.com>,
	<linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC: <yangjihong1@...wei.com>
Subject: [PATCH 2/5] perf sched: Fix memory leak in perf_sched__map()

perf_sched__map() needs to free memory of map_cpus, color_pids and
color_cpus in normal path and rollback allocated memory in error path.

Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
 tools/perf/builtin-sched.c | 41 ++++++++++++++++++++++++--------------
 1 file changed, 26 insertions(+), 15 deletions(-)

diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 08dec557e6be..26dbfa4aab61 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -3208,8 +3208,6 @@ static int perf_sched__lat(struct perf_sched *sched)
 
 static int setup_map_cpus(struct perf_sched *sched)
 {
-	struct perf_cpu_map *map;
-
 	sched->max_cpu.cpu  = sysconf(_SC_NPROCESSORS_CONF);
 
 	if (sched->map.comp) {
@@ -3218,16 +3216,15 @@ static int setup_map_cpus(struct perf_sched *sched)
 			return -1;
 	}
 
-	if (!sched->map.cpus_str)
-		return 0;
-
-	map = perf_cpu_map__new(sched->map.cpus_str);
-	if (!map) {
-		pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
-		return -1;
+	if (sched->map.cpus_str) {
+		sched->map.cpus = perf_cpu_map__new(sched->map.cpus_str);
+		if (!sched->map.cpus) {
+			pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
+			free(sched->map.comp_cpus);
+			return -1;
+		}
 	}
 
-	sched->map.cpus = map;
 	return 0;
 }
 
@@ -3267,20 +3264,34 @@ static int setup_color_cpus(struct perf_sched *sched)
 
 static int perf_sched__map(struct perf_sched *sched)
 {
+	int rc = -1;
+
 	if (setup_map_cpus(sched))
-		return -1;
+		return rc;
 
 	if (setup_color_pids(sched))
-		return -1;
+		goto out_free_map_cpus;
 
 	if (setup_color_cpus(sched))
-		return -1;
+		goto out_free_color_pids;
 
 	setup_pager();
 	if (perf_sched__read_events(sched))
-		return -1;
+		goto out_free_color_cpus;
+
+	rc = 0;
 	print_bad_events(sched);
-	return 0;
+
+out_free_color_cpus:
+	perf_cpu_map__put(sched->map.color_cpus);
+
+out_free_color_pids:
+	perf_thread_map__put(sched->map.color_pids);
+
+out_free_map_cpus:
+	free(sched->map.comp_cpus);
+	perf_cpu_map__put(sched->map.cpus);
+	return rc;
 }
 
 static int perf_sched__replay(struct perf_sched *sched)
-- 
2.34.1