linux-kernel - Re: [PATCH v2] staging: comedi: drivers: usbduxsigma.c: fix DMA buffers on stack

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Message-ID: <5127908D.5020301@mev.co.uk>
Date:	Fri, 22 Feb 2013 15:36:45 +0000
From:	Ian Abbott <abbotti@....co.uk>
To:	Kumar amit mehta <gmate.amit@...il.com>
CC:	Ian Abbott <ian.abbott@....co.uk>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"fmhess@...rs.sourceforge.net" <fmhess@...rs.sourceforge.net>,
	"hsweeten@...ionengravers.com" <hsweeten@...ionengravers.com>,
	"dan.carpenter@...cle.com" <dan.carpenter@...cle.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH v2] staging: comedi: drivers: usbduxsigma.c: fix DMA buffers
 on stack

On 2013-02-22 14:26, Kumar amit mehta wrote:
> On Fri, Feb 22, 2013 at 10:02:44AM +0000, Ian Abbott wrote:
>> On 2013-02-22 06:07, Kumar Amit Mehta wrote:
>>> This patch fixes an instance of DMA buffer on stack(being passed to
>>> usb_control_msg)for the USB-DUXsigma Board driver. Found using smatch.
>>>
>>
>> Looks good here too.
>>
>> Reviewed-by: Ian Abbott <abbotti@....co.uk>
>>
>> Would you mind doing the same for usbdux.c and usbduxfast.c?
> Sure.
> As pointed out by Dan, Do you really want the buffer to be of 16 bytes, as we
> are using only the first byte and passing the length as '1' in:
> usbduxsub_start, usbduxsub_stop, usbduxfastsub_start, usbduxfastsub_stop ?

A buffer size of 1 should be fine.

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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