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unix/stream: fix peeking with an offset larger than data in queue 

Currently, peeking on a unix stream socket with an offset larger than len of
the data in the sk receive queue returns immediately with bogus data.

This patch fixes this so that the behavior is the same as peeking with no
offset on an empty queue: the caller blocks.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Benjamin Poirier 2013-04-29 11:42:14 +00:00 committed by David S. Miller
parent 39cc86130b
commit 79f632c71b
1 changed files with 12 additions and 13 deletions
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25
net/unix/af_unix.c
View File

@ -1859,10 +1859,10 @@ out:
}
/*
* Sleep until data has arrive. But check for races..
* Sleep until more data has arrived. But check for races..
*/
static long unix_stream_data_wait(struct sock *sk, long timeo)
static long unix_stream_data_wait(struct sock *sk, long timeo,
struct sk_buff *last)
{
DEFINE_WAIT(wait);
@ -1871,7 +1871,7 @@ static long unix_stream_data_wait(struct sock *sk, long timeo)
for (;;) {
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
if (!skb_queue_empty(&sk->sk_receive_queue) ||
if (skb_peek_tail(&sk->sk_receive_queue) != last ||
sk->sk_err ||
(sk->sk_shutdown & RCV_SHUTDOWN) ||
signal_pending(current) ||
@ -1890,8 +1890,6 @@ static long unix_stream_data_wait(struct sock *sk, long timeo)
return timeo;
}
static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t size,
int flags)
@ -1936,14 +1934,12 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
goto out;
}
skip = sk_peek_offset(sk, flags);
do {
int chunk;
struct sk_buff *skb;
struct sk_buff *skb, *last;
unix_state_lock(sk);
skb = skb_peek(&sk->sk_receive_queue);
last = skb = skb_peek(&sk->sk_receive_queue);
again:
if (skb == NULL) {
unix_sk(sk)->recursion_level = 0;
@ -1966,7 +1962,7 @@ again:
break;
mutex_unlock(&u->readlock);
timeo = unix_stream_data_wait(sk, timeo);
timeo = unix_stream_data_wait(sk, timeo, last);
if (signal_pending(current)
|| mutex_lock_interruptible(&u->readlock)) {
@ -1980,10 +1976,13 @@ again:
break;
}
if (skip >= skb->len) {
skip = sk_peek_offset(sk, flags);
while (skip >= skb->len) {
skip -= skb->len;
last = skb;
skb = skb_peek_next(skb, &sk->sk_receive_queue);
goto again;
if (!skb)
goto again;
}
unix_state_unlock(sk);