linux-kernel - RE: [PATCH net] net: phy: guard against accessing a NULL features bitmap

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Date:   Fri, 11 Jan 2019 14:09:40 +0000
From:   Camelia Alexandra Groza <camelia.groza@....com>
To:     Andrew Lunn <andrew@...n.ch>
CC:     "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "hkallweit1@...il.com" <hkallweit1@...il.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "oss@...error.net" <oss@...error.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net] net: phy: guard against accessing a NULL features
 bitmap

> -----Original Message-----
> From: Andrew Lunn <andrew@...n.ch>
> Sent: Friday, January 11, 2019 15:38
> To: Camelia Alexandra Groza <camelia.groza@....com>
> Cc: f.fainelli@...il.com; hkallweit1@...il.com; davem@...emloft.net;
> oss@...error.net; netdev@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: Re: [PATCH net] net: phy: guard against accessing a NULL features
> bitmap
> 
> On Fri, Jan 11, 2019 at 01:56:46PM +0200, Camelia Groza wrote:
> > Since phy driver features became a link_mode bitmap, phy drivers that
> > don't have a list of features configured will cause the kernel to crash
> > when probed.
> 
> Hi Camelia
> 
> A NULL features is a driver bug. So i would prefer to solve this
> differently.
>
> Please make phy_driver_register() do a WARN_ON(!new_driver->features)
> and return -EINVAL.

I wasn't aware that features are mandatory. I'll make the change.

> Do you know of a specific driver which as a NULL value? We should fix
> that as well.

Yes, there are five drivers that don't have features configured: BCM8706, BCM8727, CS4340, TN2020 and KSZ8873MLL.

I'm planning to send patches on net-next for the Cortina and Teranetics ones at least, but fixing the generic crash was my priority.

Thanks,
Camelia