linux-kernel - Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

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Message-ID: <CAPhsuW6oxA+PHN=eFp2fXJ+PJXw6vr72bCuRSaVxFaSecVC8Fw@mail.gmail.com>
Date:   Wed, 30 May 2018 10:18:42 -0700
From:   Song Liu <liu.song.a23@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH][next] bpf: devmap: remove redundant assignment of dev = dev

On Wed, May 30, 2018 at 8:09 AM, Colin King <colin.king@...onical.com> wrote:
> From: Colin Ian King <colin.king@...onical.com>
>
> The assignment dev = dev is redundant and should be removed.
>
> Detected by CoverityScan, CID#1469486 ("Evaluation order violation")
>
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

Acked-by: Song Liu <songliubraving@...com>

> ---
>  kernel/bpf/devmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c
> index ae16d0c373ef..1fe3fe60508a 100644
> --- a/kernel/bpf/devmap.c
> +++ b/kernel/bpf/devmap.c
> @@ -352,7 +352,7 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_buff *xdp,
>  static void *dev_map_lookup_elem(struct bpf_map *map, void *key)
>  {
>         struct bpf_dtab_netdev *obj = __dev_map_lookup_elem(map, *(u32 *)key);
> -       struct net_device *dev = dev = obj ? obj->dev : NULL;
> +       struct net_device *dev = obj ? obj->dev : NULL;
>
>         return dev ? &dev->ifindex : NULL;
>  }
> --
> 2.17.0
>