From: "Li.Xiubo@freescale.com" <Li.Xiubo@freescale.com>
To: Mark Brown <broonie@kernel.org>
CC: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "dp@opensource.wolfsonmicro.com" <dp@opensource.wolfsonmicro.com>
Subject: RE: [PATCH 6/6] regmap: cache: Fix possible ZERO_SIZE_PTR pointer
 dereferencing error.
Thread-Topic: [PATCH 6/6] regmap: cache: Fix possible ZERO_SIZE_PTR pointer
 dereferencing error.
Thread-Index: AQHP45/r0AFxmZhor0CZKdgM8Z0nWZwt4PgAgAD7FTA=
Date: Tue, 14 Oct 2014 02:03:37 +0000
Message-ID: <d7b88c5d4d664a589f6b209be88634b0@BY2PR0301MB0613.namprd03.prod.outlook.com>
References: <1412845377-17134-1-git-send-email-Li.Xiubo@freescale.com>
 <1412845377-17134-7-git-send-email-Li.Xiubo@freescale.com>
 <20141013105450.GQ27755@sirena.org.uk>
In-Reply-To: <20141013105450.GQ27755@sirena.org.uk>
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> Subject: Re: [PATCH 6/6] regmap: cache: Fix possible ZERO_SIZE_PTR pointer
> dereferencing error.
> 
> On Thu, Oct 09, 2014 at 05:02:57PM +0800, Xiubo Li wrote:
> > When all the registers are volatile(unlikely, but logically and mostly
> > will happen for some 'device' who has very few registers), then the
> > count will be euqal to 0, then kmalloc() will return ZERO_SIZE_PTR,
> > which equals to ((void *)16).
> 
> Applied, thanks.  I'm assuming there's nothing affected by this in
> Linus' tree which needs this as a fix immediately?

Yes, this will happen on one case like my LS1 platform in late future.

Thanks,

BRs
Xiubo

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