linux-kernel - [PATCH] selftests/bpf: close the file descriptor to avoid resource leaks

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Message-ID: <20250324064234.853591-1-malayarout91@gmail.com>
Date: Mon, 24 Mar 2025 12:12:14 +0530
From: Malaya Kumar Rout <malayarout91@...il.com>
To: malayarout91@...il.com
Cc: Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	Geliang Tang <geliang@...nel.org>,
	bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] selftests/bpf: close the file descriptor to avoid resource leaks

Static Analyis for bench_htab_mem.c with cppcheck:error
tools/testing/selftests/bpf/benchs/bench_htab_mem.c:284:3:
error: Resource leak: fd [resourceLeak]
tools/testing/selftests/bpf/prog_tests/sk_assign.c:41:3:
error: Resource leak: tc [resourceLeak]

fix the issue  by closing the file descriptor (fd & tc) when
read & fgets operation fails.

Signed-off-by: Malaya Kumar Rout <malayarout91@...il.com>
---
 tools/testing/selftests/bpf/benchs/bench_htab_mem.c | 1 +
 tools/testing/selftests/bpf/prog_tests/sk_assign.c  | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/bpf/benchs/bench_htab_mem.c b/tools/testing/selftests/bpf/benchs/bench_htab_mem.c
index 926ee822143e..59746fd2c23a 100644
--- a/tools/testing/selftests/bpf/benchs/bench_htab_mem.c
+++ b/tools/testing/selftests/bpf/benchs/bench_htab_mem.c
@@ -281,6 +281,7 @@ static void htab_mem_read_mem_cgrp_file(const char *name, unsigned long *value)
 	got = read(fd, buf, sizeof(buf) - 1);
 	if (got <= 0) {
 		*value = 0;
+		close(fd);
 		return;
 	}
 	buf[got] = 0;
diff --git a/tools/testing/selftests/bpf/prog_tests/sk_assign.c b/tools/testing/selftests/bpf/prog_tests/sk_assign.c
index 0b9bd1d6f7cc..10a0ab954b8a 100644
--- a/tools/testing/selftests/bpf/prog_tests/sk_assign.c
+++ b/tools/testing/selftests/bpf/prog_tests/sk_assign.c
@@ -37,8 +37,10 @@ configure_stack(void)
 	tc = popen("tc -V", "r");
 	if (CHECK_FAIL(!tc))
 		return false;
-	if (CHECK_FAIL(!fgets(tc_version, sizeof(tc_version), tc)))
+	if (CHECK_FAIL(!fgets(tc_version, sizeof(tc_version), tc))) {
+		pclose(tc);
 		return false;
+	}
 	if (strstr(tc_version, ", libbpf "))
 		prog = "test_sk_assign_libbpf.bpf.o";
 	else
-- 
2.43.0