From 7424ce65065852bdf7a040bf2490da4a8fc4b464 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 20 Nov 2014 07:01:29 -0500 Subject: [atm] switch vcc_sendmsg() to copy_from_iter() ... and make it handle multi-segment iovecs - deals with that "fix this later" issue for free. A bit of shame, really - it had been there since 2.3.15pre3 when the whole thing went into the tree, practically a historical artefact by now... Signed-off-by: Al Viro --- net/atm/common.c | 17 ++++++----------- 1 file changed, 6 insertions(+), 11 deletions(-) diff --git a/net/atm/common.c b/net/atm/common.c index 9cd1ccae9a11..f59112944c91 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -570,15 +570,16 @@ int vcc_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg, } int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, - size_t total_len) + size_t size) { struct sock *sk = sock->sk; DEFINE_WAIT(wait); struct atm_vcc *vcc; struct sk_buff *skb; int eff, error; - const void __user *buff; - int size; + struct iov_iter from; + + iov_iter_init(&from, WRITE, m->msg_iov, m->msg_iovlen, size); lock_sock(sk); if (sock->state != SS_CONNECTED) { @@ -589,12 +590,6 @@ int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, error = -EISCONN; goto out; } - if (m->msg_iovlen != 1) { - error = -ENOSYS; /* fix this later @@@ */ - goto out; - } - buff = m->msg_iov->iov_base; - size = m->msg_iov->iov_len; vcc = ATM_SD(sock); if (test_bit(ATM_VF_RELEASED, &vcc->flags) || test_bit(ATM_VF_CLOSE, &vcc->flags) || @@ -607,7 +602,7 @@ int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, error = 0; goto out; } - if (size < 0 || size > vcc->qos.txtp.max_sdu) { + if (size > vcc->qos.txtp.max_sdu) { error = -EMSGSIZE; goto out; } @@ -639,7 +634,7 @@ int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, goto out; skb->dev = NULL; /* for paths shared with net_device interfaces */ ATM_SKB(skb)->atm_options = vcc->atm_options; - if (copy_from_user(skb_put(skb, size), buff, size)) { + if (copy_from_iter(skb_put(skb, size), size, &from) != size) { kfree_skb(skb); error = -EFAULT; goto out; -- cgit v1.2.3