linux-kernel - RE: [PATCH 6/6] regmap: cache: Fix possible ZERO_SIZE

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Message-ID: <d7b88c5d4d664a589f6b209be88634b0@BY2PR0301MB0613.namprd03.prod.outlook.com>
Date:	Tue, 14 Oct 2014 02:03:37 +0000
From:	"Li.Xiubo@...escale.com" <Li.Xiubo@...escale.com>
To:	Mark Brown <broonie@...nel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dp@...nsource.wolfsonmicro.com" <dp@...nsource.wolfsonmicro.com>
Subject: RE: [PATCH 6/6] regmap: cache: Fix possible ZERO_SIZE_PTR pointer
 dereferencing error.

> 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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