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

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Message-ID: <20160408140701.GA3547@kroah.com>
Date:	Fri, 8 Apr 2016 07:07:01 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Chunfeng Yun <chunfeng.yun@...iatek.com>
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, 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?

Shouldn't we fix that issue instead?

thanks,

greg k-h