linux-kernel - Re: [PATCH bpf-next 4/4] selftests/bpf: Add a null pointer check for the serial_test_tp_attach

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Date: Fri, 10 May 2024 16:21:04 +0800
From: Kunwu Chan <kunwu.chan@...mail.com>
To: Daniel Borkmann <daniel@...earbox.net>, ast@...nel.org,
 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
Subject: Re: [PATCH bpf-next 4/4] selftests/bpf: Add a null pointer check for
 the serial_test_tp_attach_query

Thanks all for your reply.

On 2024/5/3 23:47, Daniel Borkmann wrote:
> 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@...inos.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"))

Thanks, I'll update it in v2:

1: Use ASSERT_OK_PTR instead of CHECK

2: Add a suggested-by tag for you

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