netdev - RE: UDP data corruption in v4.4

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Date:   Mon, 27 Jul 2020 18:38:39 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Greg KH <greg@...ah.com>
CC:     Al Viro <viro@...iv.linux.org.uk>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        'Eric Dumazet' <edumazet@...gle.com>,
        'Willy Tarreau' <w@....eu>,
        Joseph Salisbury <Joseph.Salisbury@...rosoft.com>,
        Michael Kelley <mikelley@...rosoft.com>
Subject: RE: UDP data corruption in v4.4

> From: Greg KH <greg@...ah.com>
> Sent: Friday, July 24, 2020 10:59 PM
> > [...]
> > Eric Dumazet made an alternative that performs the csum validation earlier:
> >
> > --- a/net/ipv4/udp.c
> > +++ b/net/ipv4/udp.c
> > @@ -1589,8 +1589,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct
> > sk_buff *skb)
> >                 }
> >         }
> >
> > -       if (rcu_access_pointer(sk->sk_filter) &&
> > -           udp_lib_checksum_complete(skb))
> > +       if (udp_lib_checksum_complete(skb))
> >                 goto csum_error;
> >
> >         if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) {
> >
> > I personally like Eric's fix and IMHO we'd better have it in v4.4 rather than
> > trying to backport 327868212381.
> 
> Does Eric's fix work with your testing?  

Yes, it worked in my testing overnight.

> If so, great, can you turn it
> into something I can apply to the 4.4.y stable tree and send it to
> stable@...r.kernel.org?
> 
> greg k-h

Will do shortly.

Thanks,
Dexuan