On Wed, 7 Sep 2016 15:53:56 -0400 Jarod Wilson <ja...@redhat.com> wrote:
> --- a/net/core/dev.c > +++ b/net/core/dev.c > @@ -6466,9 +6466,17 @@ int dev_set_mtu(struct net_device *dev, int new_mtu) > if (new_mtu == dev->mtu) > return 0; > > - /* MTU must be positive. */ > - if (new_mtu < 0) > + if (new_mtu < dev->min_mtu) { > + netdev_err(dev, "Invalid MTU %d requested, hw min %d\n", > + new_mtu, dev->min_mtu); > return -EINVAL; > + } > + > + if (new_mtu > dev->max_mtu) { > + netdev_err(dev, "Invalid MTU %d requested, hw max %d\n", > + new_mtu, dev->min_mtu); > + return -EINVAL; > + } > Maybe don't log something that can be triggered from a user program. Or at least rate limit it.