linux-kernel - Re: [PATCH bpf-next v3 2/2] selftests/bpf: Add malloc failure checks in bpf

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Date:   Mon, 30 Oct 2023 12:39:48 -0700
From:   Kui-Feng Lee <sinquersw@...il.com>
To:     Yuran Pereira <yuran.pereira@...mail.com>, bpf@...r.kernel.org,
        yonghong.song@...ux.dev
Cc:     ast@...nel.org, brauner@...nel.org, daniel@...earbox.net,
        haoluo@...gle.com, iii@...ux.ibm.com, john.fastabend@...il.com,
        jolsa@...nel.org, kpsingh@...nel.org, kuifeng@...a.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        mykolal@...com, sdf@...gle.com, shuah@...nel.org, song@...nel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH bpf-next v3 2/2] selftests/bpf: Add malloc failure checks
 in bpf_iter

Acked-by: Kui-Feng Lee <thinker.li@...il.com>

On 10/27/23 22:24, Yuran Pereira wrote:
> Since some malloc calls in bpf_iter may at times fail,
> this patch adds the appropriate fail checks, and ensures that
> any previously allocated resource is appropriately destroyed
> before returning the function.
> 
> Signed-off-by: Yuran Pereira <yuran.pereira@...mail.com>
> ---
>   tools/testing/selftests/bpf/prog_tests/bpf_iter.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> index 123a3502b8f0..1e02d1ba1c18 100644
> --- a/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> +++ b/tools/testing/selftests/bpf/prog_tests/bpf_iter.c
> @@ -698,7 +698,7 @@ static void test_overflow(bool test_e2big_overflow, bool ret1)
>   		goto free_link;
>   
>   	buf = malloc(expected_read_len);
> -	if (!buf)
> +	if (!ASSERT_OK_PTR(buf, "malloc"))
>   		goto close_iter;
>   
>   	/* do read */
> @@ -868,6 +868,8 @@ static void test_bpf_percpu_hash_map(void)
>   
>   	skel->rodata->num_cpus = bpf_num_possible_cpus();
>   	val = malloc(8 * bpf_num_possible_cpus());
> +	if (!ASSERT_OK_PTR(val, "malloc"))
> +		goto out;
>   
>   	err = bpf_iter_bpf_percpu_hash_map__load(skel);
>   	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_hash_map__load"))
> @@ -1044,6 +1046,8 @@ static void test_bpf_percpu_array_map(void)
>   
>   	skel->rodata->num_cpus = bpf_num_possible_cpus();
>   	val = malloc(8 * bpf_num_possible_cpus());
> +	if (!ASSERT_OK_PTR(val, "malloc"))
> +		goto out;
>   
>   	err = bpf_iter_bpf_percpu_array_map__load(skel);
>   	if (!ASSERT_OK_PTR(skel, "bpf_iter_bpf_percpu_array_map__load"))