# Re: \[PATCH v2 net-next\] hv\_netvsc: Copy packets sent by Hyper-V out of the receive buffer

- From: Andrea Parri \<parri.andrea@gmail.com\>
- Date: 2021-02-03 11:19:11 
- List: netdev
- Page: https://ratatoskr.run/netdev/2021/02/6256875
- Thread: https://ratatoskr.run/linux-hyperv/2021/01/6248251/t.md

```text
On Tue, Feb 02, 2021 at 11:45:49AM -0800, Jakub Kicinski wrote:
> On Tue, 2 Feb 2021 09:18:43 +0100 Andrea Parri wrote:
> > Hi net maintainers,
> > 
> > 
> > On Sat, Jan 30, 2021 at 12:50:06AM +0000, patchwork-bot+netdevbpf@kernel.org wrote:
> > > Hello:
> > > 
> > > This patch was applied to netdev/net-next.git (refs/heads/master):
> > > 
> > > On Tue, 26 Jan 2021 17:29:07 +0100 you wrote:  
> > > > Pointers to receive-buffer packets sent by Hyper-V are used within the
> > > > guest VM.  Hyper-V can send packets with erroneous values or modify
> > > > packet fields after they are processed by the guest.  To defend against
> > > > these scenarios, copy (sections of) the incoming packet after validating
> > > > their length and offset fields in netvsc_filter_receive().  In this way,
> > > > the packet can no longer be modified by the host.
> > > > 
> > > > [...]  
> > > 
> > > Here is the summary with links:
> > >   - [v2,net-next] hv_netvsc: Copy packets sent by Hyper-V out of the receive buffer
> > >     https://git.kernel.org/netdev/net-next/c/0ba35fe91ce3  
> > 
> > I'd have some fixes on top of this and I'm wondering about the process: would
> > you consider fixes/patches on top of this commit now? 
> 
> Fixes for bugs present in Linus's tree?
> 
> You need to target the net tree, and give us instructions on how to
> resolve the conflict which will arise from merging net into net-next.
> 
> > would you rather prefer me to squash these fixes into a v3? other?
> 
> Networking trees are immutable, and v2 was already applied. We could
> do a revert, apply fix, apply v3, but we prefer to just handle the 
> merge conflict.

Thanks for the clarification, Jakub.

And sorry for the confusion; let me just send out the 'fixes'/patches (I
have one targeting the net tree and two targeting the net-next tree, with
no conflict between them), so that they can be reviewed and we can agree
/discuss any further steps.

Thanks,
  Andrea
```