linux-kernel - Re: [PATCH] usb: core: buffer: avoid NULL pointer dereferrence

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Message-ID: <1460343705.10419.12.camel@mhfsdcap03>
Date:	Mon, 11 Apr 2016 11:01:45 +0800
From:	chunfeng yun <chunfeng.yun@...iatek.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH] usb: core: buffer: avoid NULL pointer dereferrence

On Fri, 2016-04-08 at 07:07 -0700, Greg Kroah-Hartman wrote:
> On Fri, Apr 08, 2016 at 05:08:03PM +0800, Chunfeng Yun wrote:
> > NULL pointer dereferrence will happen when class driver
> > wants to allocate zero length buffer and pool_max[0]
> > can't be used, so skip reserved pool in this case.
> 
> Why would a driver want to allocate a 0 length buffer?  What driver does
> this?
It's misc/usbtest.c
> 
> Shouldn't we fix that issue instead?
I don't know which way is better, but it seems simple to fix it up in
buffer.c 
> 
> thanks,
> 
> greg k-h