linux-kernel - Re: [PATCH V6] virtio-net: fix the race between refill work and close

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Date:   Wed, 27 Jul 2022 12:30:13 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jason Wang <jasowang@...hat.com>
Cc:     mst@...hat.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, xuanzhuo@...ux.alibaba.com
Subject: Re: [PATCH V6] virtio-net: fix the race between refill work and close

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Mon, 25 Jul 2022 15:21:59 +0800 you wrote:
> We try using cancel_delayed_work_sync() to prevent the work from
> enabling NAPI. This is insufficient since we don't disable the source
> of the refill work scheduling. This means an NAPI poll callback after
> cancel_delayed_work_sync() can schedule the refill work then can
> re-enable the NAPI that leads to use-after-free [1].
> 
> Since the work can enable NAPI, we can't simply disable NAPI before
> calling cancel_delayed_work_sync(). So fix this by introducing a
> dedicated boolean to control whether or not the work could be
> scheduled from NAPI.
> 
> [...]

Here is the summary with links:
  - [V6] virtio-net: fix the race between refill work and close
    https://git.kernel.org/netdev/net/c/5a159128faff

You are awesome, thank you!
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