netdev - Re: [PATCH net] net: datagram: fix unbounded loop in __skb_try_recv

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Date:   Wed, 27 Mar 2019 21:59:53 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     pabeni@...hat.com
Cc:     netdev@...r.kernel.org, alexander.duyck@...il.com,
        christoph.paasch@...il.com
Subject: Re: [PATCH net] net: datagram: fix unbounded loop in
 __skb_try_recv_datagram()

From: Paolo Abeni <pabeni@...hat.com>
Date: Mon, 25 Mar 2019 14:18:06 +0100

> Christoph reported a stall while peeking datagram with an offset when
> busy polling is enabled. __skb_try_recv_datagram() uses as the loop
> termination condition 'queue empty'. When peeking, the socket
> queue can be not empty, even when no additional packets are received.
> 
> Address the issue explicitly checking for receive queue changes,
> as currently done by __skb_wait_for_more_packets().
> 
> Fixes: 2b5cd0dfa384 ("net: Change return type of sk_busy_loop from bool to void")
> Reported-and-tested-by: Christoph Paasch <cpaasch@...le.com>
> Signed-off-by: Paolo Abeni <pabeni@...hat.com>

Applied and queued up for -stable, thanks Paolo.