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Subject: Re: [PATCH bpf-next 4/4] selftests/bpf: Add a null pointer check for
 the serial_test_tp_attach_query
To: Kunwu Chan <chentao@kylinos.cn>, ast@kernel.org, andrii@kernel.org,
 martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org,
 yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org,
 sdf@google.com, haoluo@google.com, jolsa@kernel.org, mykolal@fb.com,
 shuah@kernel.org, kunwu.chan@hotmail.com
Cc: bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
 linux-kernel@vger.kernel.org
References: <20240424020444.2375773-1-chentao@kylinos.cn>
 <20240424020444.2375773-5-chentao@kylinos.cn>
From: Daniel Borkmann <daniel@iogearbox.net>
Message-ID: <79df3541-5557-05fa-a81e-84728d509bfc@iogearbox.net>
Date: Fri, 3 May 2024 17:47:30 +0200
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On 4/24/24 4:04 AM, Kunwu Chan wrote:
> There is a 'malloc' call, which can be unsuccessful.
> Add the malloc failure checking to avoid possible null
> dereference.
> 
> Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
> ---
>   tools/testing/selftests/bpf/prog_tests/tp_attach_query.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
> index 655d69f0ff0b..302b25408a53 100644
> --- a/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
> +++ b/tools/testing/selftests/bpf/prog_tests/tp_attach_query.c
> @@ -39,6 +39,9 @@ void serial_test_tp_attach_query(void)
>   	attr.wakeup_events = 1;
>   
>   	query = malloc(sizeof(*query) + sizeof(__u32) * num_progs);
> +	if (CHECK(!query, "malloc()", "error:%s\n", strerror(errno)))

Series looks reasonable, small nit on CHECK() : Lets use ASSERT*() macros given they are
preferred over the latter :

if (!ASSERT_OK_PTR(buf, "malloc"))

> +		return;
> +
>   	for (i = 0; i < num_progs; i++) {
>   		err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj[i],
>   				    &prog_fd[i]);
>