linux-kernel - Re: [PATCH] net: phy: Handle postive return codes in phy

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Message-ID: <20150905194400.GA1687@deathstar>
Date:	Sat, 5 Sep 2015 14:44:01 -0500
From:	Michael Welling <mwelling@...e.org>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	Florian Fainelli <f.fainelli@...il.com>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: phy: Handle postive return codes in phy_connect

On Sat, Sep 05, 2015 at 09:18:40PM +0200, Andrew Lunn wrote:
> On Sat, Sep 05, 2015 at 01:01:29PM -0500, Michael Welling wrote:
> > The function phy_connect_direct can possibly return a positive
> > return code. Using ERR_PTR with a positive value can lead to
> > deferencing of an invalid pointer.
> 
> Is this the correct fix? Would it not be better to find where the
> positive return code is from and fix that?

I guess I can trace it back to find out where the positive return code
is originating.

Is phy_connect_direct always supposed to return valid -errno?

> 
> 	 Andrew
> 
> > Signed-off-by: Michael Welling <mwelling@...e.org>
> > ---
> >  drivers/net/phy/phy_device.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
> > index c0f2111..a7e14a6 100644
> > --- a/drivers/net/phy/phy_device.c
> > +++ b/drivers/net/phy/phy_device.c
> > @@ -477,6 +477,9 @@ struct phy_device *phy_connect(struct net_device *dev, const char *bus_id,
> >  	phydev = to_phy_device(d);
> >  
> >  	rc = phy_connect_direct(dev, phydev, handler, interface);
> > +	if (rc > 0)
> > +		return ERR_PTR(-ENODEV);
> > +
> >  	if (rc)
> >  		return ERR_PTR(rc);
> >  
> > -- 
> > 2.1.4
> > 
> > --
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