linux-kernel - Re: [patch v2] edac i5000, i5400: fix pointer math in i5000_get_mc

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Date:	Mon, 05 Mar 2012 11:07:23 +0100
From:	walter harms <wharms@....de>
To:	Dan Carpenter <dan.carpenter@...cle.com>
CC:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [patch v2] edac i5000, i5400: fix pointer math in i5000_get_mc_regs()



Am 05.03.2012 10:52, schrieb Dan Carpenter:
> On Mon, Mar 05, 2012 at 10:45:39AM +0100, walter harms wrote:
>>
>>
>> Am 05.03.2012 10:01, schrieb Dan Carpenter:
>>> "pvt->ambase" is a u64 datatype.  The intent here is to fill the first
>>> half in the first call to pci_read_config_dword() and the other half in
>>> the second.  Unfortunately the pointer math is wrong so we set the wrong
>>> data.
>>>
>>> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
>>> ---
>>> v2: Redid it as with a union as Walter Harms suggested.
>>>     Fixed the same bug in i5400_edac.c as well.
>>>
>>> I don't have this hardware, so please review carefully.
>>>
>>> diff --git a/drivers/edac/i5400_edac.c b/drivers/edac/i5400_edac.c
>>> index 74d6ec34..083e80a 100644
>>> --- a/drivers/edac/i5400_edac.c
>>> +++ b/drivers/edac/i5400_edac.c
>>> @@ -343,7 +343,13 @@ struct i5400_pvt {
>>>  	struct pci_dev *branch_1;		/* 22.0 */
>>>  
>>>  	u16 tolm;				/* top of low memory */
>>> -	u64 ambase;				/* AMB BAR */
>>> +	union {
>>> +		u64 ambase;				/* AMB BAR */
>>> +		struct {
>>> +			u32 ambase_bottom;
>>> +			u32 ambase_top;
>>> +		} u;
>>> +	};
>>>  
>>
>> would this work with alignment=8 ?
> 
> Are you asking or telling?
> 

asking, i am really curious.

re,
 wh

> I guess I'll add a __packed and resend in case it's an issue.
> 
> regards,
> dan carpenter
> 
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