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

From: Eric Dumazet
Date: Mon Apr 29 2013 - 20:48:43 EST

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@xxxxxxx>
> ---

Acked-by: Eric Dumazet <edumazet@xxxxxxxxxx>

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