linux-kernel - Re: [PATCH bpf-next v2 3/4] selftests/bpf: Add a null pointer check for the load_btf

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Date: Fri, 10 May 2024 16:23:22 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: kunwu.chan@...ux.dev, 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: Muhammad Usama Anjum <usama.anjum@...labora.com>, bpf@...r.kernel.org,
 linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
 Kunwu Chan <chentao@...inos.cn>
Subject: Re: [PATCH bpf-next v2 3/4] selftests/bpf: Add a null pointer check
 for the load_btf_spec

On 5/10/24 2:58 PM, kunwu.chan@...ux.dev wrote:
> From: Kunwu Chan <chentao@...inos.cn>
> 
> 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>
LGTM
Reviewed-by: Muhammad Usama Anjum <usama.anjum@...labora.com>

> ---
>  tools/testing/selftests/bpf/test_verifier.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/bpf/test_verifier.c b/tools/testing/selftests/bpf/test_verifier.c
> index df04bda1c927..9c80b2943418 100644
> --- a/tools/testing/selftests/bpf/test_verifier.c
> +++ b/tools/testing/selftests/bpf/test_verifier.c
> @@ -762,6 +762,8 @@ static int load_btf_spec(__u32 *types, int types_len,
>  	);
>  
>  	raw_btf = malloc(sizeof(hdr) + types_len + strings_len);
> +	if (!raw_btf)
> +		return -ENOMEM;
>  
>  	ptr = raw_btf;
>  	memcpy(ptr, &hdr, sizeof(hdr));

-- 
BR,
Muhammad Usama Anjum