linux-kernel - [PATCH bpf-next v2] selftests/bpf:fix a resource leak

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Message-Id: <20240710015913.2554-1-zhujun2@cmss.chinamobile.com>
Date: Tue,  9 Jul 2024 18:59:13 -0700
From: Zhu Jun <zhujun2@...s.chinamobile.com>
To: jolsa@...nel.org,
	shuah@...nel.org,
	ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	mykolal@...com,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	zhujun2@...s.chinamobile.com
Subject: [PATCH bpf-next v2] selftests/bpf:fix a resource leak

The requested resources should be closed before return
in main(), otherwise resource leak will occur

Signed-off-by: Zhu Jun <zhujun2@...s.chinamobile.com>
---
Changes in v2:
 - check for cg_fd >= 0 and have just one out label

 tools/testing/selftests/bpf/test_sockmap.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
index a34e95040994..285a9a714666 100644
--- a/tools/testing/selftests/bpf/test_sockmap.c
+++ b/tools/testing/selftests/bpf/test_sockmap.c
@@ -2075,8 +2075,10 @@ int main(int argc, char **argv)
 
 	if (!cg_fd) {
 		cg_fd = cgroup_setup_and_join(CG_PATH);
-		if (cg_fd < 0)
-			return cg_fd;
+		if (cg_fd < 0) {
+			err = cg_fd;
+			goto out;
+		}
 		cg_created = 1;
 	}
 
@@ -2092,7 +2094,7 @@ int main(int argc, char **argv)
 	if (err) {
 		fprintf(stderr, "populate program: (%s) %s\n",
 			bpf_file, strerror(errno));
-		return 1;
+		goto out;
 	}
 	running = 1;
 
@@ -2109,7 +2111,8 @@ int main(int argc, char **argv)
 		free(options.whitelist);
 	if (options.blacklist)
 		free(options.blacklist);
-	close(cg_fd);
+	if (cg_fd >= 0)
+		close(cg_fd);
 	if (cg_created)
 		cleanup_cgroup_environment();
 	return err;
-- 
2.17.1