linux-kernel - Re: [PATCH 2/2] HID: picolcd: sanity check report size in raw

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Date:	Wed, 27 Aug 2014 10:25:48 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Bruno Prémont <bonbons@...ux-vserver.org>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] HID: picolcd: sanity check report size in raw_event()
 callback

On Wed, 27 Aug 2014, Bruno Prémont wrote:

> > The report passed to us from transport driver could potentially be 
> > arbitrarily large, therefore we better sanity-check it so that raw_data 
> > that we hold in picolcd_pending structure are always kept within proper 
> > bounds.
> > 
> > Cc: stable@...r.kernel.org
> > Reported-by: Steven Vittitoe <scvitti@...gle.com>
> > Signed-off-by: Jiri Kosina <jkosina@...e.cz>
> 
> Acked-by: Bruno Prémont <bonbons@...ux-vserver.org>

Thanks.

> > ---
> >  drivers/hid/hid-picolcd_core.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
> > index acbb0210..020df3c 100644
> > --- a/drivers/hid/hid-picolcd_core.c
> > +++ b/drivers/hid/hid-picolcd_core.c
> > @@ -350,6 +350,12 @@ static int picolcd_raw_event(struct hid_device *hdev,
> >  	if (!data)
> >  		return 1;
> >  
> > +	if (size > 64) {
> > +		hid_warn(hdev, "invalid size value (%d) for picolcd raw event\n",
> > +				size);
> 
> Is it worth adding report->id to this hid_warn()?
> 
> A valid device is not expected to ever send >64 bytes reports but in
> case a firmware update would do so it would help to know for which
> report it was.

It definitely wouldn't hurt. Pull request with the original patch is now 
on its way to Linus though, so let's do this as a followup patch on top 
once this is merged.

-- 
Jiri Kosina
SUSE Labs
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