linux-kernel - RE: [PATCH] usb: gadget: return the right length in ffs_epfile

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Message-ID: <27240C0AC20F114CBF8149A2696CBE4A01C3D5AF@SHSMSX101.ccr.corp.intel.com>
Date:	Tue, 4 Mar 2014 07:47:58 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	"balbi@...com" <balbi@...com>
CC:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"mina86@...a86.com" <mina86@...a86.com>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Cohen, David A" <david.a.cohen@...el.com>,
	"Zhuang, Jin Can" <jin.can.zhuang@...el.com>,
	"Wang, Yu Y" <yu.y.wang@...el.com>
Subject: RE: [PATCH] usb: gadget: return the right length in ffs_epfile_io()

Hello Balbi,

> -----Original Message-----
> From: Felipe Balbi [mailto:balbi@...com]
> Sent: Tuesday, March 04, 2014 12:30 AM
> To: Liu, Chuansheng
> Cc: balbi@...com; gregkh@...uxfoundation.org; mina86@...a86.com;
> linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org; Cohen, David A;
> Zhuang, Jin Can; Wang, Yu Y
> Subject: Re: [PATCH] usb: gadget: return the right length in ffs_epfile_io()
> 
> Hi,
> 
> On Thu, Feb 27, 2014 at 02:49:31PM +0800, Chuansheng Liu wrote:
> > When the request length is aligned to maxpacketsize, sometimes
> > the return length ret > the user space requested len.
> >
> > At that time, we will use min_t(size_t, ret, len) to limit the
> > size in case of user data buffer overflow.
> >
> > But we need return the min_t(size_t, ret, len) to tell the user
> > space rightly also.
> >
> > Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>

> please rebase on my "testing/next" branch

Based on your branch "testing/next", I have sent patch v2 with some ack
and reviewing, thanks.

[PATCH v2] usb: gadget: return the right length in ffs_epfile_io()


Best Regards
Chuansheng

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