netdev - [PATCH AUTOSEL 5.18 009/159] selftests/bpf: Fix file descriptor leak in load

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Date:   Mon, 30 May 2022 09:21:54 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yuntao Wang <ytcoode@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Sasha Levin <sashal@...nel.org>, shuah@...nel.org,
        ast@...nel.org, daniel@...earbox.net,
        linux-kselftest@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Subject: [PATCH AUTOSEL 5.18 009/159] selftests/bpf: Fix file descriptor leak in load_kallsyms()

From: Yuntao Wang <ytcoode@...il.com>

[ Upstream commit 2d0df01974ce2b59b6f7d5bd3ea58d74f12ddf85 ]

Currently, if sym_cnt > 0, it just returns and does not close file, fix it.

Signed-off-by: Yuntao Wang <ytcoode@...il.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Link: https://lore.kernel.org/bpf/20220405145711.49543-1-ytcoode@gmail.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/testing/selftests/bpf/trace_helpers.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c
index 3d6217e3aff7..9c4be2cdb21a 100644
--- a/tools/testing/selftests/bpf/trace_helpers.c
+++ b/tools/testing/selftests/bpf/trace_helpers.c
@@ -25,15 +25,12 @@ static int ksym_cmp(const void *p1, const void *p2)
 
 int load_kallsyms(void)
 {
-	FILE *f = fopen("/proc/kallsyms", "r");
+	FILE *f;
 	char func[256], buf[256];
 	char symbol;
 	void *addr;
 	int i = 0;
 
-	if (!f)
-		return -ENOENT;
-
 	/*
 	 * This is called/used from multiplace places,
 	 * load symbols just once.
@@ -41,6 +38,10 @@ int load_kallsyms(void)
 	if (sym_cnt)
 		return 0;
 
+	f = fopen("/proc/kallsyms", "r");
+	if (!f)
+		return -ENOENT;
+
 	while (fgets(buf, sizeof(buf), f)) {
 		if (sscanf(buf, "%p %c %s", &addr, &symbol, func) != 3)
 			break;
-- 
2.35.1