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From: Johan Hovold <johan@kernel.org>
To: Octavian Purdila <octavian.purdila@intel.com>
Cc: gregkh@linuxfoundation.org, linus.walleij@linaro.org,
	gnurou@gmail.com, wsa@the-dreams.de, sameo@linux.intel.com,
	lee.jones@linaro.org, arnd@arndb.de, johan@kernel.org,
	daniel.baluta@intel.com, laurentiu.palcu@intel.com,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org
Subject: Re: [PATCH v3 1/3] mfd: add support for Diolan DLN-2 devices
Date: Mon, 8 Sep 2014 14:08:20 +0200	[thread overview]
Message-ID: <20140908120820.GB9560@localhost> (raw)
In-Reply-To: <20140908113233.GA9560@localhost>

On Mon, Sep 08, 2014 at 01:32:33PM +0200, Johan Hovold wrote:
> On Fri, Sep 05, 2014 at 06:17:57PM +0300, Octavian Purdila wrote:

> > +static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd,
> > +			  void *obuf, int obuf_len, void *ibuf, int *ibuf_len)
> > +{

<snip>

> > +	/* if we got here we know that the response header has been checked */
> > +	rsp = rxc->urb->transfer_buffer;
> > +	result = le16_to_cpu(rsp->result);
> 
> Yes, but you haven't verified that rsp->hdr.size > 0, so you may still
> be reading stale data.

I meant that you haven't verified that the payload size > 1 (the header
size is included in rsp->hdr.size and result is two byte wide).

> > +
> > +	if (result) {
> > +		dev_dbg(dev, "%d received response with error %d\n",
> > +			handle, result);
> > +		ret = -EREMOTEIO;
> > +		goto out_free_rx_slot;
> > +	}
> > +
> > +	if (!ibuf) {
> > +		ret = 0;
> > +		goto out_free_rx_slot;
> > +	}
> > +
> > +	if (*ibuf_len > rxc->urb->actual_length - sizeof(*rsp))
> > +		*ibuf_len = rxc->urb->actual_length - sizeof(*rsp);
> 
> And then you get an underflow here, although that doesn't seem to cause
> any troubles in this case.

Unless ibuf_len is -1... 

> But why isn't ibuf_len unsigned?
>
> > +
> > +	memcpy(ibuf, rsp + 1, *ibuf_len);
> > +
> > +out_free_rx_slot:
> > +	free_rx_slot(dln2, rxs, rx_slot);
> > +
> > +	return ret;
> > +}

Johan

  reply	other threads:[~2014-09-08 12:10 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-09-05 15:17 [PATCH v3 0/3] mfd: add support for Diolan DLN-2 Octavian Purdila
     [not found] ` <1409930279-1382-1-git-send-email-octavian.purdila-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
2014-09-05 15:17   ` [PATCH v3 1/3] mfd: add support for Diolan DLN-2 devices Octavian Purdila
2014-09-08 11:32     ` Johan Hovold
2014-09-08 12:08       ` Johan Hovold [this message]
2014-09-08 13:20       ` Octavian Purdila
2014-09-08 13:24         ` Lee Jones
2014-09-08 13:45         ` Johan Hovold
2014-09-05 15:17   ` [PATCH v3 2/3] i2c: add support for Diolan DLN-2 USB-I2C adapter Octavian Purdila
2014-09-08 14:44     ` Johan Hovold
2014-09-08 15:57       ` Octavian Purdila
2014-09-08 16:30         ` Johan Hovold
2014-09-08 17:15           ` Octavian Purdila
     [not found]             ` <CAE1zotJomxwAJA3aXm9MHnHd5Pg9V=K7XaptOPWkArV0jio4DQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-08 17:28               ` Johan Hovold
2014-09-09  8:20             ` Lee Jones
2014-09-05 15:17   ` [PATCH v3 3/3] gpio: add support for the Diolan DLN-2 USB GPIO driver Octavian Purdila
2014-09-05 15:38     ` Johan Hovold
2014-09-05 16:04       ` Octavian Purdila
     [not found]         ` <CAE1zotK4QkA9PWW=uOmM-j=N=MNuBt1v3CgdA+GXctdFUZ3QKA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2014-09-09  9:36           ` Johan Hovold
2014-09-09 10:27             ` Octavian Purdila
2014-09-08 16:22     ` Johan Hovold
2014-09-08 16:44     ` Johan Hovold

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