On Wed, Oct 27, 2021 at 06:26:40AM -0700, Jakub Kicinski wrote:
> On Wed, 27 Oct 2021 03:23:17 -0400 Michael S. Tsirkin wrote:
> > > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > > index c501b5974aee..b7f35aff8e82 100644
> > > --- a/drivers/net/virtio_net.c
> > > +++ b/drivers/net/virtio_net.c
> > > @@ -3177,12 +3177,16 @@ static int virtnet_probe(struct virtio_device *vdev)
> > > dev->max_mtu = MAX_MTU;
> > >
> > > /* Configuration may specify what MAC to use. Otherwise random. */
> > > - if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC))
> > > + if (virtio_has_feature(vdev, VIRTIO_NET_F_MAC)) {
> > > + u8 addr[MAX_ADDR_LEN];
> > > +
> > > virtio_cread_bytes(vdev,
> > > offsetof(struct virtio_net_config, mac),
> > > - dev->dev_addr, dev->addr_len);
> > > - else
> > > + addr, dev->addr_len);
> >
> > Maybe BUG_ON(dev->addr_len > sizeof addr);
> >
> > here just to make sure we don't overflow addr silently?
>
> Since I need to post a v2 and we're talking... can I just use
> eth_hw_addr_set() instead? AFAICT netdev is always allocated with
> alloc_etherdev_mq() and ->addr_len never changed. Plus there is
> a number of Ethernet address helpers used so ETH_ALEN is kind of
> already assumed.
Right. Sure, just document this in the commit log pls.
> > > + dev_addr_set(dev, addr);
> > > + } else {
> > > eth_hw_addr_random(dev);
> > > + }
> > >
> > > /* Set up our device-specific information */
> > > vi = netdev_priv(dev);
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