netdev - Re: [PATCH net v3] virtio_net: fix wrong buf address calculation when using xdp

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Date:   Tue, 26 Apr 2022 13:00:10 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Nikolay Aleksandrov <razor@...ckwall.org>
Cc:     netdev@...r.kernel.org, kuba@...nel.org, davem@...emloft.net,
        stable@...r.kernel.org, jasowang@...hat.com,
        xuanzhuo@...ux.alibaba.com, daniel@...earbox.net, mst@...hat.com,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH net v3] virtio_net: fix wrong buf address calculation when
 using xdp

Hello:

This patch was applied to netdev/net.git (master)
by Paolo Abeni <pabeni@...hat.com>:

On Mon, 25 Apr 2022 13:37:03 +0300 you wrote:
> We received a report[1] of kernel crashes when Cilium is used in XDP
> mode with virtio_net after updating to newer kernels. After
> investigating the reason it turned out that when using mergeable bufs
> with an XDP program which adjusts xdp.data or xdp.data_meta page_to_buf()
> calculates the build_skb address wrong because the offset can become less
> than the headroom so it gets the address of the previous page (-X bytes
> depending on how lower offset is):
>  page_to_skb: page addr ffff9eb2923e2000 buf ffff9eb2923e1ffc offset 252 headroom 256
> 
> [...]

Here is the summary with links:
  - [net,v3] virtio_net: fix wrong buf address calculation when using xdp
    https://git.kernel.org/netdev/net/c/acb16b395c3f

You are awesome, thank you!
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