diff options
| author | Benjamin Poirier <bpoirier@suse.de> | 2013-04-29 11:42:12 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-04-30 00:43:54 -0400 |
| commit | add05ad4e9f5c4efee9b98535db5efa32b0d0492 (patch) | |
| tree | 02e1a52c30f67fa5951ebf38944eff6351672149 /net | |
| parent | e5195c1f31f399289347e043d6abf3ffa80f0005 (diff) | |
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>
Diffstat (limited to 'net')
| -rw-r--r-- | net/core/datagram.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c index 368f9c3f9dc..99c4f525b1d 100644 --- a/net/core/datagram.c +++ b/net/core/datagram.c @@ -187,7 +187,8 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned int flags, skb_queue_walk(queue, skb) { *peeked = skb->peeked; if (flags & MSG_PEEK) { - if (*off >= skb->len && skb->len) { + if (*off >= skb->len && (skb->len || *off || + skb->peeked)) { *off -= skb->len; continue; } |