From: Benjamin Poirier <bpoirier@suse.de>
Date: Mon, 29 Apr 2013 11:42:12 +0000 (+0000)
Subject: unix/dgram: peek beyond 0-sized skbs
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~77^2~15^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=add05ad4e9f5c4efee9b98535db5efa32b0d0492;p=pandora-kernel.git

unix/dgram: peek beyond 0-sized skbs

"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@suse.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

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