linux-kernel - Re: [PATCH] Fix application of sizeof to pointer

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Date:   Wed, 20 Oct 2021 10:55:27 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     davidcomponentone@...il.com
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        Andrii Nakryiko <andrii@...nel.org>, Martin Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        KP Singh <kpsingh@...nel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] Fix application of sizeof to pointer

On Tue, Oct 12, 2021 at 4:17 AM <davidcomponentone@...il.com> wrote:
>
> From: David Yang <davidcomponentone@...il.com>
>
> The coccinelle check report:
> "./samples/bpf/xdp_redirect_cpu_user.c:397:32-38:
> ERROR: application of sizeof to pointer"
> Using the "strlen" to fix it.
>
> Reported-by: Zeal Robot <zealci@....com.cn>
> Signed-off-by: David Yang <davidcomponentone@...il.com>
> ---

For future submissions, please use [PATCH bpf-next] subject prefix.
For changes that are targeted against BPF samples, please use
samples/bpf: prefix as well. So in this case the patch subject should
have been something like:

[PATCH bpf-next] samples/bpf: Fix application of sizeof to pointer

I've fixed it up and applied to bpf-next, thanks.

>  samples/bpf/xdp_redirect_cpu_user.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/samples/bpf/xdp_redirect_cpu_user.c b/samples/bpf/xdp_redirect_cpu_user.c
> index 6e25fba64c72..d84e6949007c 100644
> --- a/samples/bpf/xdp_redirect_cpu_user.c
> +++ b/samples/bpf/xdp_redirect_cpu_user.c
> @@ -325,7 +325,6 @@ int main(int argc, char **argv)
>         int add_cpu = -1;
>         int ifindex = -1;
>         int *cpu, i, opt;
> -       char *ifname;
>         __u32 qsize;
>         int n_cpus;
>
> @@ -393,9 +392,8 @@ int main(int argc, char **argv)
>                                 fprintf(stderr, "-d/--dev name too long\n");
>                                 goto end_cpu;
>                         }
> -                       ifname = (char *)&ifname_buf;
> -                       safe_strncpy(ifname, optarg, sizeof(ifname));
> -                       ifindex = if_nametoindex(ifname);
> +                       safe_strncpy(ifname_buf, optarg, strlen(ifname_buf));
> +                       ifindex = if_nametoindex(ifname_buf);
>                         if (!ifindex)
>                                 ifindex = strtoul(optarg, NULL, 0);
>                         if (!ifindex) {
> --
> 2.30.2
>