netdev - Re: [PATCH net-next v3 1/4] bpf, mlx5: fix mlx5e_create

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Date:   Mon, 21 Nov 2016 11:27:16 +0200
From:   Saeed Mahameed <saeedm@....mellanox.co.il>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <alexei.starovoitov@...il.com>,
        Brenden Blanco <bblanco@...mgrid.com>,
        Zhiyi Sun <zhiyisun@...il.com>,
        Rana Shahout <ranas@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>,
        Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v3 1/4] bpf, mlx5: fix mlx5e_create_rq taking
 reference on prog

On Sat, Nov 19, 2016 at 2:45 AM, Daniel Borkmann <daniel@...earbox.net> wrote:
> In mlx5e_create_rq(), when creating a new queue, we call bpf_prog_add() but
> without checking the return value. bpf_prog_add() can fail since 92117d8443bc
> ("bpf: fix refcnt overflow"), so we really must check it. Take the reference
> right when we assign it to the rq from priv->xdp_prog, and just drop the
> reference on error path. Destruction in mlx5e_destroy_rq() looks good, though.
>
> Fixes: 86994156c736 ("net/mlx5e: XDP fast RX drop bpf programs support")
> Signed-off-by: Daniel Borkmann <daniel@...earbox.net>

Acked-by: Saeed Mahameed <saeedm@...lanox.com>