Commit 802788bf authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by David S. Miller

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: default avatarHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: default avatarUrsula Braun <ursula.braun@de.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent aa8e71f5
......@@ -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 */
......
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