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

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Message-ID: <YXC5RS1iziEqPlHK@postoffice.intern>
Date:   Thu, 21 Oct 2021 08:50:13 +0800
From:   David Yang <davidcomponentone@...il.com>
To:     Andrii Nakryiko <andrii.nakryiko@...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

OK, Thanks.

On Wed, Oct 20, 2021 at 10:55:27AM -0700, Andrii Nakryiko wrote:
> 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
> >