netdev - Re: [PATCH v2] hdlcdrv: fix divide error bug if bitrate is 0

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Date:   Fri, 19 May 2017 17:41:17 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     firogm@...il.com
Cc:     t.sailer@...mni.ethz.ch, wharms@....de, andreyknvl@...gle.com,
        linux-hams@...r.kernel.org, gregkh@...uxfoundation.org,
        netdev@...r.kernel.org
Subject: Re: [PATCH v2] hdlcdrv: fix divide error bug if bitrate is 0

From: Firo Yang <firogm@...il.com>
Date: Fri, 19 May 2017 21:21:46 +0800

> @@ -576,6 +576,10 @@ static int hdlcdrv_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
>  	case HDLCDRVCTL_CALIBRATE:
>  		if(!capable(CAP_SYS_RAWIO))
>  			return -EPERM;
> +		if (!netif_running(dev))
> +			return -ENODEV;
> +		if (!(s->par.bitrate > 0))
> +			return -EINVAL;

This test is so un-canonical and convoluted.

Please use something more straightforward.  I really think Alan
Cox's patch handled this more cleanly.  Make the test something
like "if (x <= 0) return -EINVAL;".

I also am not convinced about the netif_running() test and at
best it is a separate change from this divide by zero bug fix
so belongs in a separate patch.

Thank you.