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

[Julia Lawall]

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