netdev - Re: [PATCH net] udp: fix the proto value passed to ip_protocol_deliver

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Message-Id: <20201207.003345.926564522711614096.davem@davemloft.net>
Date:   Mon, 07 Dec 2020 00:33:45 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     lucien.xin@...il.com
Cc:     netdev@...r.kernel.org, kuba@...nel.org, pablo@...filter.org,
        gnault@...hat.com
Subject: Re: [PATCH net] udp: fix the proto value passed to
 ip_protocol_deliver_rcu for the segments

From: Xin Long <lucien.xin@...il.com>
Date: Mon,  7 Dec 2020 15:55:40 +0800

> Guillaume noticed that: for segments udp_queue_rcv_one_skb() returns the
> proto, and it should pass "ret" unmodified to ip_protocol_deliver_rcu().
> Otherwize, with a negtive value passed, it will underflow inet_protos.
> 
> This can be reproduced with IPIP FOU:
> 
>   # ip fou add port 5555 ipproto 4
>   # ethtool -K eth1 rx-gro-list on
> 
> Fixes: cf329aa42b66 ("udp: cope with UDP GRO packet misdirection")
> Reported-by: Guillaume Nault <gnault@...hat.com>
> Signed-off-by: Xin Long <lucien.xin@...il.com>

Applied and queued up for -stable, thanks!