netdev - Re: Minimum MTU Mess

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Message-ID: <20160907133535.2cfac7bc@xeon-e3>
Date:   Wed, 7 Sep 2016 13:35:35 -0700
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Jarod Wilson <jarod@...hat.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: Minimum MTU Mess

On Wed, 7 Sep 2016 15:53:56 -0400
Jarod Wilson <jarod@...hat.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.