netdev - Re: [PATCH bpf] libbpf: fix another GCC8 warning for strncpy

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Date:   Tue, 16 Jul 2019 19:31:17 +0200
From:   Magnus Karlsson <magnus.karlsson@...il.com>
To:     Andrii Nakryiko <andriin@...com>
Cc:     Alexei Starovoitov <ast@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        bpf <bpf@...r.kernel.org>,
        Network Development <netdev@...r.kernel.org>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        kernel-team@...com, Magnus Karlsson <magnus.karlsson@...el.com>
Subject: Re: [PATCH bpf] libbpf: fix another GCC8 warning for strncpy

On Tue, Jul 16, 2019 at 5:59 AM Andrii Nakryiko <andriin@...com> wrote:
>
> Similar issue was fixed in cdfc7f888c2a ("libbpf: fix GCC8 warning for
> strncpy") already. This one was missed. Fixing now.

Thanks Andrii.

Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>

> Cc: Magnus Karlsson <magnus.karlsson@...el.com>
> Signed-off-by: Andrii Nakryiko <andriin@...com>
> ---
>  tools/lib/bpf/xsk.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/xsk.c b/tools/lib/bpf/xsk.c
> index b33740221b7e..5007b5d4fd2c 100644
> --- a/tools/lib/bpf/xsk.c
> +++ b/tools/lib/bpf/xsk.c
> @@ -517,7 +517,8 @@ int xsk_socket__create(struct xsk_socket **xsk_ptr, const char *ifname,
>                 err = -errno;
>                 goto out_socket;
>         }
> -       strncpy(xsk->ifname, ifname, IFNAMSIZ);
> +       strncpy(xsk->ifname, ifname, IFNAMSIZ - 1);
> +       xsk->ifname[IFNAMSIZ - 1] = '\0';
>
>         err = xsk_set_xdp_socket_config(&xsk->config, usr_config);
>         if (err)
> --
> 2.17.1
>