linux-kernel - Re: [PATCH v3 1/3] unix/dgram: peek beyond 0-sized skbs

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Message-ID: <1367282900.8964.334.camel@edumazet-glaptop>
Date:	Mon, 29 Apr 2013 17:48:20 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Benjamin Poirier <bpoirier@...e.de>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cong Wang <xiyou.wangcong@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/3] unix/dgram: peek beyond 0-sized skbs

On Mon, 2013-04-29 at 17:42 -0400, Benjamin Poirier wrote:
> "77c1090 net: fix infinite loop in __skb_recv_datagram()" (v3.8) introduced a
> regression:
> After that commit, recv can no longer peek beyond a 0-sized skb in the queue.
> __skb_recv_datagram() instead stops at the first skb with len == 0 and results
> in the system call failing with -EFAULT via skb_copy_datagram_iovec().
> 
> When peeking at an offset with 0-sized skb(s), each one of those is received
> only once, in sequence. The offset starts moving forward again after receiving
> datagrams with len > 0.
> 
> Signed-off-by: Benjamin Poirier <bpoirier@...e.de>
> 
> ---

Acked-by: Eric Dumazet <edumazet@...gle.com>


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