From 802788bf90f78e7f248e78d4d0510bb00e976db8 Mon Sep 17 00:00:00 2001 From: Hendrik Brueckner Date: Tue, 21 Apr 2009 23:26:26 +0000 Subject: [PATCH] af_iucv: cleanup and refactor recvmsg() EFAULT handling If the skb cannot be copied to user iovec, always return -EFAULT. The skb is enqueued again, except MSG_PEEK flag is set, to allow user space applications to correct its iovec pointer. Signed-off-by: Hendrik Brueckner Signed-off-by: Ursula Braun Signed-off-by: David S. Miller --- net/iucv/af_iucv.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c index 95e38d3..f0dea1b 100644 --- a/net/iucv/af_iucv.c +++ b/net/iucv/af_iucv.c @@ -965,7 +965,6 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, int noblock = flags & MSG_DONTWAIT; struct sock *sk = sock->sk; struct iucv_sock *iucv = iucv_sk(sk); - int target; unsigned int copied, rlen; struct sk_buff *skb, *rskb, *cskb; int err = 0; @@ -979,8 +978,6 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, if (flags & (MSG_OOB)) return -EOPNOTSUPP; - target = sock_rcvlowat(sk, flags & MSG_WAITALL, len); - skb = skb_recv_datagram(sk, flags, noblock, &err); if (!skb) { if (sk->sk_shutdown & RCV_SHUTDOWN) @@ -993,10 +990,9 @@ static int iucv_sock_recvmsg(struct kiocb *iocb, struct socket *sock, cskb = skb; if (memcpy_toiovec(msg->msg_iov, cskb->data, copied)) { - skb_queue_head(&sk->sk_receive_queue, skb); - if (copied == 0) - return -EFAULT; - goto done; + if (!(flags & MSG_PEEK)) + skb_queue_head(&sk->sk_receive_queue, skb); + return -EFAULT; } /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ -- 2.7.4