linux-kernel - Re: [PATCH 3/5] ACPI, APEI, HEST Fix the unsuitable usage of platform

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Message-ID: <20100921124308.GC18991@one.firstfloor.org>
Date:	Tue, 21 Sep 2010 14:43:08 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, linux-acpi@...r.kernel.org,
	Jin Dongming <jin.dongming@...css.fujitsu.com>
Subject: Re: [PATCH 3/5] ACPI, APEI, HEST Fix the unsuitable usage of platform_data

On Sun, Sep 19, 2010 at 11:00:33AM +0800, Huang Ying wrote:
> diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c
> index 343168d..1a3508a 100644
> --- a/drivers/acpi/apei/hest.c
> +++ b/drivers/acpi/apei/hest.c
> @@ -137,20 +137,23 @@ static int hest_parse_ghes_count(struct acpi_hest_header *hest_hdr, void *data)
>  
>  static int hest_parse_ghes(struct acpi_hest_header *hest_hdr, void *data)

hest_hdr is a local variable on the stack.


> +
> +	rc = platform_device_add_data(ghes_dev, &hest_hdr, sizeof(void *));
> +	if (rc)
> +		goto err;

Now you put the address of that local variable in some global data structure.

And then you likely return and later the access accesses random stack space? 

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only.
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