linux-kernel - [PATCH bpf-next 2/4] selftests/bpf/sockopt: Add a null pointer check for the run

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Date: Wed, 24 Apr 2024 10:04:42 +0800
From: Kunwu Chan <chentao@...inos.cn>
To: 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@...gle.com,
	haoluo@...gle.com,
	jolsa@...nel.org,
	mykolal@...com,
	shuah@...nel.org,
	kunwu.chan@...mail.com
Cc: bpf@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Kunwu Chan <chentao@...inos.cn>
Subject: [PATCH bpf-next 2/4] selftests/bpf/sockopt: Add a null pointer check for the run_test

There is a 'malloc' call, which can be unsuccessful.
Add the malloc failure checking to avoid possible null
dereference and give more information
about test fail reasons.

Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 tools/testing/selftests/bpf/prog_tests/sockopt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/testing/selftests/bpf/prog_tests/sockopt.c b/tools/testing/selftests/bpf/prog_tests/sockopt.c
index 5a4491d4edfe..bde63e1f74dc 100644
--- a/tools/testing/selftests/bpf/prog_tests/sockopt.c
+++ b/tools/testing/selftests/bpf/prog_tests/sockopt.c
@@ -1100,6 +1100,12 @@ static int run_test(int cgroup_fd, struct sockopt_test *test, bool use_io_uring)
 		}
 
 		optval = malloc(test->get_optlen);
+		if (!optval) {
+			log_err("Failed to allocate memory");
+			ret = -1;
+			goto close_sock_fd;
+		}
+
 		memset(optval, 0, test->get_optlen);
 		socklen_t optlen = test->get_optlen;
 		socklen_t expected_get_optlen = test->get_optlen_ret ?:
-- 
2.40.1