From cbbd26b8b1a6af9c02e2b6523e12bd50cc765059 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 1 Nov 2016 22:09:04 -0400 Subject: [iov_iter] new primitives - copy_from_iter_full() and friends copy_from_iter_full(), copy_from_iter_full_nocache() and csum_and_copy_from_iter_full() - counterparts of copy_from_iter() et.al., advancing iterator only in case of successful full copy and returning whether it had been successful or not. Convert some obvious users. *NOTE* - do not blindly assume that something is a good candidate for those unless you are sure that not advancing iov_iter in failure case is the right thing in this case. Anything that does short read/short write kind of stuff (or is in a loop, etc.) is unlikely to be a good one. Signed-off-by: Al Viro --- net/atm/common.c | 2 +- net/bluetooth/l2cap_core.c | 6 +++--- net/packet/af_packet.c | 5 +---- net/tipc/msg.c | 4 ++-- 4 files changed, 7 insertions(+), 10 deletions(-) (limited to 'net') diff --git a/net/atm/common.c b/net/atm/common.c index 6dc12305799e..a3ca922d307b 100644 --- a/net/atm/common.c +++ b/net/atm/common.c @@ -630,7 +630,7 @@ int vcc_sendmsg(struct socket *sock, struct msghdr *m, size_t size) goto out; skb->dev = NULL; /* for paths shared with net_device interfaces */ ATM_SKB(skb)->atm_options = vcc->atm_options; - if (copy_from_iter(skb_put(skb, size), size, &m->msg_iter) != size) { + if (!copy_from_iter_full(skb_put(skb, size), size, &m->msg_iter)) { kfree_skb(skb); error = -EFAULT; goto out; diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c index 577f1c01454a..ce0b5dd01953 100644 --- a/net/bluetooth/l2cap_core.c +++ b/net/bluetooth/l2cap_core.c @@ -2127,7 +2127,7 @@ static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, struct sk_buff **frag; int sent = 0; - if (copy_from_iter(skb_put(skb, count), count, &msg->msg_iter) != count) + if (!copy_from_iter_full(skb_put(skb, count), count, &msg->msg_iter)) return -EFAULT; sent += count; @@ -2147,8 +2147,8 @@ static inline int l2cap_skbuff_fromiovec(struct l2cap_chan *chan, *frag = tmp; - if (copy_from_iter(skb_put(*frag, count), count, - &msg->msg_iter) != count) + if (!copy_from_iter_full(skb_put(*frag, count), count, + &msg->msg_iter)) return -EFAULT; sent += count; diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index d2238b204691..588ec202d5ba 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2432,14 +2432,11 @@ static int __packet_snd_vnet_parse(struct virtio_net_hdr *vnet_hdr, size_t len) static int packet_snd_vnet_parse(struct msghdr *msg, size_t *len, struct virtio_net_hdr *vnet_hdr) { - int n; - if (*len < sizeof(*vnet_hdr)) return -EINVAL; *len -= sizeof(*vnet_hdr); - n = copy_from_iter(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter); - if (n != sizeof(*vnet_hdr)) + if (!copy_from_iter_full(vnet_hdr, sizeof(*vnet_hdr), &msg->msg_iter)) return -EFAULT; return __packet_snd_vnet_parse(vnet_hdr, *len); diff --git a/net/tipc/msg.c b/net/tipc/msg.c index 17201aa8423d..a22be502f1bd 100644 --- a/net/tipc/msg.c +++ b/net/tipc/msg.c @@ -268,7 +268,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, __skb_queue_tail(list, skb); skb_copy_to_linear_data(skb, mhdr, mhsz); pktpos = skb->data + mhsz; - if (copy_from_iter(pktpos, dsz, &m->msg_iter) == dsz) + if (copy_from_iter_full(pktpos, dsz, &m->msg_iter)) return dsz; rc = -EFAULT; goto error; @@ -299,7 +299,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, if (drem < pktrem) pktrem = drem; - if (copy_from_iter(pktpos, pktrem, &m->msg_iter) != pktrem) { + if (!copy_from_iter_full(pktpos, pktrem, &m->msg_iter)) { rc = -EFAULT; goto error; } -- cgit v1.2.3