1 files changed, 29 insertions, 16 deletions

diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 586229a..e52a447 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1676,7 +1676,7 @@ retry:
 			if (len < hhlen)
 				skb_reset_network_header(skb);
 		}
-		err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
+		err = memcpy_from_msg(skb_put(skb, len), msg, len);
 		if (err)
 			goto out_free;
 		goto retry;
@@ -2095,6 +2095,18 @@ static void tpacket_destruct_skb(struct sk_buff *skb)
 	sock_wfree(skb);
 }
 
+static bool ll_header_truncated(const struct net_device *dev, int len)
+{
+	/* net device doesn't like empty head */
+	if (unlikely(len <= dev->hard_header_len)) {
+		net_warn_ratelimited("%s: packet size is too short (%d < %d)\n",
+				     current->comm, len, dev->hard_header_len);
+		return true;
+	}
+
+	return false;
+}
+
 static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
 		void *frame, struct net_device *dev, int size_max,
 		__be16 proto, unsigned char *addr, int hlen)
@@ -2170,12 +2182,8 @@ static int tpacket_fill_skb(struct packet_sock *po, struct sk_buff *skb,
 		if (unlikely(err < 0))
 			return -EINVAL;
 	} else if (dev->hard_header_len) {
-		/* net device doesn't like empty head */
-		if (unlikely(tp_len <= dev->hard_header_len)) {
-			pr_err("packet size is too short (%d < %d)\n",
-			       tp_len, dev->hard_header_len);
+		if (ll_header_truncated(dev, tp_len))
 			return -EINVAL;
-		}
 
 		skb_push(skb, dev->hard_header_len);
 		err = skb_store_bits(skb, 0, data,
@@ -2400,6 +2408,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 	unsigned short gso_type = 0;
 	int hlen, tlen;
 	int extra_len = 0;
+	ssize_t n;
 
 	/*
 	 *	Get and verify the address.
@@ -2438,9 +2447,9 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 
 		len -= vnet_hdr_len;
 
-		err = memcpy_fromiovec((void *)&vnet_hdr, msg->msg_iov,
-				       vnet_hdr_len);
-		if (err < 0)
+		err = -EFAULT;
+		n = copy_from_iter(&vnet_hdr, vnet_hdr_len, &msg->msg_iter);
+		if (n != vnet_hdr_len)
 			goto out_unlock;
 
 		if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
@@ -2503,12 +2512,17 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
 	skb_set_network_header(skb, reserve);
 
 	err = -EINVAL;
-	if (sock->type == SOCK_DGRAM &&
-	    (offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len)) < 0)
-		goto out_free;
+	if (sock->type == SOCK_DGRAM) {
+		offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
+		if (unlikely(offset) < 0)
+			goto out_free;
+	} else {
+		if (ll_header_truncated(dev, len))
+			goto out_free;
+	}
 
 	/* Returns -EFAULT on error */
-	err = skb_copy_datagram_from_iovec(skb, offset, msg->msg_iov, 0, len);
+	err = skb_copy_datagram_from_iter(skb, offset, &msg->msg_iter, len);
 	if (err)
 		goto out_free;
 
@@ -2946,8 +2960,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
 			vnet_hdr.flags = VIRTIO_NET_HDR_F_DATA_VALID;
 		} /* else everything is zero */
 
-		err = memcpy_toiovec(msg->msg_iov, (void *)&vnet_hdr,
-				     vnet_hdr_len);
+		err = memcpy_to_msg(msg, (void *)&vnet_hdr, vnet_hdr_len);
 		if (err < 0)
 			goto out_free;
 	}
@@ -2962,7 +2975,7 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
 		msg->msg_flags |= MSG_TRUNC;
 	}
 
-	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	err = skb_copy_datagram_msg(skb, 0, msg, copied);
 	if (err)
 		goto out_free;