linux-kernel - Re: [PATCH bpf] xdp: fix possible cq entry leak

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Message-ID: <CALDO+SYaR+txmTq_xhaw1cD4v7svtE7BD3mOsBx-X=MEVeZzzA@mail.gmail.com>
Date:   Mon, 8 Jul 2019 14:25:20 -0700
From:   William Tu <u9012063@...il.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Ilya Maximets <i.maximets@...sung.com>,
        Netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Xdp <xdp-newbies@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Björn Töpel <bjorn.topel@...el.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf] xdp: fix possible cq entry leak

On Thu, Jul 4, 2019 at 11:49 PM Björn Töpel <bjorn.topel@...il.com> wrote:
>
> On Thu, 4 Jul 2019 at 16:25, Ilya Maximets <i.maximets@...sung.com> wrote:
> >
> > Completion queue address reservation could not be undone.
> > In case of bad 'queue_id' or skb allocation failure, reserved entry
> > will be leaked reducing the total capacity of completion queue.
> >
> > Fix that by moving reservation to the point where failure is not
> > possible. Additionally, 'queue_id' checking moved out from the loop
> > since there is no point to check it there.
> >
>
> Good catch, Ilya! Thanks for the patch!
>
> Acked-by: Björn Töpel <bjorn.topel@...el.com>
>
Thanks
Tested-by: William Tu <u9012063@...il.com>