linux-kernel - Re: [PATCH net-next 1/2] virtio-net: correctly update XDP

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Message-Id: <20180731.100316.237748978913578486.davem@davemloft.net>
Date:   Tue, 31 Jul 2018 10:03:16 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jasowang@...hat.com
Cc:     mst@...hat.com, virtualization@...ts.linux-foundation.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        makita.toshiaki@....ntt.co.jp
Subject: Re: [PATCH net-next 1/2] virtio-net: correctly update XDP_TX
 counters

From: Jason Wang <jasowang@...hat.com>
Date: Tue, 31 Jul 2018 17:43:38 +0800

> Commit 5b8f3c8d30a6 ("virtio_net: Add XDP related stats") tries to
> count TX XDP stats in virtnet_receive(). This will cause several
> issues:
> 
> - virtnet_xdp_sq() was called without checking whether or not XDP is
>   set. This may cause out of bound access when there's no enough txq
>   for XDP.
> - Stats were updated even if there's no XDP/XDP_TX.
> 
> Fixing this by reusing virtnet_xdp_xmit() for XDP_TX which can counts
> TX XDP counter itself and remove the unnecessary tx stats embedded in
> rx stats.
> 
> Reported-by: syzbot+604f8271211546f5b3c7@...kaller.appspotmail.com
> Fixes: 5b8f3c8d30a6 ("virtio_net: Add XDP related stats")
> Cc: Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
> Signed-off-by: Jason Wang <jasowang@...hat.com>

Applied.