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

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Message-Id: <20130430.004408.1248228240476926838.davem@davemloft.net>
Date:	Tue, 30 Apr 2013 00:44:08 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	bpoirier@...e.de
Cc:	edumazet@...gle.com, xemul@...allels.com, 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

From: Benjamin Poirier <bpoirier@...e.de>
Date: Mon, 29 Apr 2013 17:42:12 -0400

> "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>

Applied.
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