netdev - RE: [PATCH] net: sched: fix skb leak in dev_requeue

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Date:   Mon, 25 Dec 2017 03:38:04 +0000
From:   "weiyongjun (A)" <weiyongjun1@...wei.com>
To:     John Fastabend <john.fastabend@...il.com>,
        Jamal Hadi Salim <jhs@...atatu.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Jiri Pirko <jiri@...nulli.us>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH] net: sched: fix skb leak in dev_requeue_skb()

> When dev_requeue_skb() is called with bluked skb list, only the
> first skb of the list will be requeued to qdisc layer, and leak
> the others without free them.
> 
> TCP is broken due to skb leak since no free skb will be considered
> as still in the host queue and never be retransmitted. This happend
> when dev_requeue_skb() called from qdisc_restart().
>   qdisc_restart
>   |-- dequeue_skb
>   |-- sch_direct_xmit()
>       |-- dev_requeue_skb() <-- skb may bluked
> 
> Fix dev_requeue_skb() to requeue the full bluked list.
> 
> Fixes: a53851e2c321 ("net: sched: explicit locking in gso_cpu fallback")
> Signed-off-by: Wei Yongjun <weiyongjun1@...wei.com>

Sorry, I forgot the 'net-next' prefix, please ignore this one, I will resend it.