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

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Message-ID: <47c7cc21-6e4c-63a6-7649-5486fcd43607@iogearbox.net>
Date:   Fri, 12 Jul 2019 15:07:18 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Ilya Maximets <i.maximets@...sung.com>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
        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>
Subject: Re: [PATCH bpf] xdp: fix possible cq entry leak

On 07/04/2019 04:25 PM, Ilya Maximets 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.
> 
> Fixes: 35fcde7f8deb ("xsk: support for Tx")
> Signed-off-by: Ilya Maximets <i.maximets@...sung.com>

Applied, thanks!