linux-kernel - RE: [PATCH] net: dsa: loop: Check for memory allocation failure

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Message-ID: <alpine.DEB.2.20.1705082031280.3440@hadrien>
Date:   Mon, 8 May 2017 20:32:23 +0800 (SGT)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     David Laight <David.Laight@...LAB.COM>
cc:     'Christophe JAILLET' <christophe.jaillet@...adoo.fr>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "vivien.didelot@...oirfairelinux.com" 
        <vivien.didelot@...oirfairelinux.com>,
        "f.fainelli@...il.com" <f.fainelli@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: RE: [PATCH] net: dsa: loop: Check for memory allocation failure



On Mon, 8 May 2017, David Laight wrote:

> From: Christophe JAILLET
> > Sent: 06 May 2017 06:30
> > If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> > Return -ENOMEM instead, as done for some other memory allocation just a
> > few lines above.
> ...
> > --- a/drivers/net/dsa/dsa_loop.c
> > +++ b/drivers/net/dsa/dsa_loop.c
> > @@ -256,6 +256,9 @@ static int dsa_loop_drv_probe(struct mdio_device *mdiodev)
> >  		return -ENOMEM;
> >
> >  	ps = devm_kzalloc(&mdiodev->dev, sizeof(*ps), GFP_KERNEL);
> > +	if (!ps)
> > +		return -ENOMEM;
> > +
> >  	ps->netdev = dev_get_by_name(&init_net, pdata->netdev);
> >  	if (!ps->netdev)
> >  		return -EPROBE_DEFER;
>
> On the face if it this code leaks like a sieve.

I don't think so.  The allocations (dsa_switch_alloc and devm_kzalloc) use
devm functions.

julia