linux-kernel - RE: [PATCH v3 bpf] trace: bpf: Fix passing zero to PTR

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Date:   Mon, 09 Nov 2020 13:18:01 -0800
From:   John Fastabend <john.fastabend@...il.com>
To:     Wang Qing <wangqing@...o.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>
Subject: RE: [PATCH v3 bpf] trace: bpf: Fix passing zero to PTR_ERR()

Wang Qing wrote:
> There is a bug when passing zero to PTR_ERR() and return.
> Fix smatch err.
> 
> Signed-off-by: Wang Qing <wangqing@...o.com>
> ---
>  kernel/trace/bpf_trace.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 4517c8b..5113fd4
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -1198,7 +1198,7 @@ static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size,
>  	*btf = bpf_get_btf_vmlinux();
>  
>  	if (IS_ERR_OR_NULL(*btf))
> -		return PTR_ERR(*btf);
> +		return IS_ERR(*btf) ? PTR_ERR(*btf) : -EINVAL;
>  
>  	if (ptr->type_id > 0)
>  		*btf_id = ptr->type_id;
> -- 
> 2.7.4
> 

Acked-by: John Fastabend <john.fastabend@...il.com>