linux-kernel - Re: [PATCH] sh: maple: add support for Maple controller as a joystick

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Date:	Sat, 20 Dec 2008 16:07:27 +0000
From:	Adrian McMenamin <adrian@...golddream.dyndns.info>
To:	Matt Fleming <matt@...sole-pimps.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-sh <linux-sh@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH] sh: maple: add support for Maple controller as a
 joystick

On Sat, 2008-12-20 at 15:16 +0000, Matt Fleming wrote:
> On Fri, Dec 19, 2008 at 11:15:42PM +0000, Adrian McMenamin wrote:
> > 
> > Add support for the SEGA Dreamcast Maple controller as a joystick
> > 
> 
> [snip]
> 
> > +	struct dc_pad *pad = maple_get_drvdata(mapledev);
> > +	struct input_dev *dev = pad->dev;
> > +	unsigned char *res = mq->recvbuf;
> > +
> > +	buttons = ~cpu_to_le16(*(unsigned short *)(res + 8));
> > +
> 
> I may be wrong but shouldn't this use the I/O accessor functions?
> 

It's not iomemory, so I don't think so. The maple bus writes to a buffer
in the physical RAM.


> > +
> > +	pad = kzalloc(sizeof(struct dc_pad), GFP_KERNEL);
> > +	idev = input_allocate_device();
> > +	if (!pad || !idev){
> > +		error = ENOMEM;
> > +		goto fail;
> > +	}
> 
> [snip]
> 
> > +fail:
> > +	input_free_device(pad->dev);
> 
> Possible NULL pointer dereference?

No, because input_free_device is:

void input_free_device(struct input_dev *dev)
{
        if (dev)
               input_put_device(dev);
}
EXPORT_SYMBOL(input_free_device);

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