macvtap: signal truncated packets

macvtap_put_user() never return a value grater than iov length, this in fact
bypasses the truncated checking in macvtap_recvmsg(). Fix this by always
returning the size of packet plus the possible vlan header to let the trunca
checking work.

Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
index 957cc5c..2a89da0 100644 (file)
--- a/drivers/net/macvtap.c
+++ b/drivers/net/macvtap.c
@@ -770,7 +770,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
        int ret;
        int vnet_hdr_len = 0;
        int vlan_offset = 0;
-       int copied;
+       int copied, total;
 
        if (q->flags & IFF_VNET_HDR) {
                struct virtio_net_hdr vnet_hdr;
@@ -785,7 +785,8 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
                if (memcpy_toiovecend(iv, (void *)&vnet_hdr, 0, sizeof(vnet_hdr)))
                        return -EFAULT;
        }
-       copied = vnet_hdr_len;
+       total = copied = vnet_hdr_len;
+       total += skb->len;
 
        if (!vlan_tx_tag_present(skb))
                len = min_t(int, skb->len, len);
@@ -800,6 +801,7 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
 
                vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
                len = min_t(int, skb->len + VLAN_HLEN, len);
+               total += VLAN_HLEN;
 
                copy = min_t(int, vlan_offset, len);
                ret = skb_copy_datagram_const_iovec(skb, 0, iv, copied, copy);
@@ -817,10 +819,9 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q,
        }
 
        ret = skb_copy_datagram_const_iovec(skb, vlan_offset, iv, copied, len);
-       copied += len;
 
 done:
-       return ret ? ret : copied;
+       return ret ? ret : total;
 }
 
 static ssize_t macvtap_do_read(struct macvtap_queue *q, struct kiocb *iocb,
@@ -875,7 +876,7 @@ static ssize_t macvtap_aio_read(struct kiocb *iocb, const struct iovec *iv,
        }
 
        ret = macvtap_do_read(q, iocb, iv, len, file->f_flags & O_NONBLOCK);
-       ret = min_t(ssize_t, ret, len); /* XXX copied from tun.c. Why? */
+       ret = min_t(ssize_t, ret, len);
        if (ret > 0)
                iocb->ki_pos = ret;
 out: