linux-kernel - Re: [PATCH] iio: 104-quad-8: Fix off-by-one error when addressing flag register

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Date:   Tue, 14 Mar 2017 11:00:43 -0400
From:   William Breathitt Gray <vilhelm.gray@...il.com>
To:     stable@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: 104-quad-8: Fix off-by-one error when addressing
 flag register

On Mon, Mar 13, 2017 at 09:33:45PM +0000, Jonathan Cameron wrote:
>On 13/03/17 13:33, William Breathitt Gray wrote:
>> On Sat, Feb 11, 2017 at 09:37:35AM +0000, Jonathan Cameron wrote:
>>> On 09/02/17 15:03, William Breathitt Gray wrote:
>>>> The flag register is offset by 1 from the respective channel data
>>>> register. This patch fixes an off-by-one error when attempting to read a
>>>> channel flag register where the base address was not properly offset.
>>>>
>>>> Fixes: 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support for the ACCES 104-QUAD-8")
>>>> Signed-off-by: William Breathitt Gray <vilhelm.gray@...il.com>
>>> Applied to the fixes-togreg-post-rc1 branch of iio.git
>>> Clue to when this will go upstream is in the name ;)
>>>
>>> Thanks,
>>>
>>> Jonathan
>> 
>> Hi Jonathan,
>> 
>> I see that this fix made it into 4.11-rc1 but not the 4.10.2 release.
>> Is this patch on track to appear in stable, or should I explicitly CC
>> stable@...r.kernel.org to pick this up?
>I was half asleep and failed to tag this in the first place.
>
>Send an email to stable@...r.kernel.org with the commit ID and a request
>that it is picked up.  Cc me.
>
>Jonathan
>> 
>> Thanks,
>> 
>> William Breathitt Gray
>> 

Hello,

This patch was merged into Linus' tree as commit ca8d8e03b4c9 ("iio:
104-quad-8: Fix off-by-one error when addressing flag register"). This
fix should be merged into the 4.10 stable tree as well to fix an
off-by-one error which causes garbage data to be read as count values --
effectively preventing proper usage of the driver.

This patch fixes commit 28e5d3bb0325 ("iio: 104-quad-8: Add IIO support
for the ACCES 104-QUAD-8").

Thank you,

William Breathitt Gray

>>>> ---
>>>>  drivers/iio/counter/104-quad-8.c | 2 +-
>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/iio/counter/104-quad-8.c b/drivers/iio/counter/104-quad-8.c
>>>> index a5913e97945e..f9b8fc9ae13f 100644
>>>> --- a/drivers/iio/counter/104-quad-8.c
>>>> +++ b/drivers/iio/counter/104-quad-8.c
>>>> @@ -76,7 +76,7 @@ static int quad8_read_raw(struct iio_dev *indio_dev,
>>>>  			return IIO_VAL_INT;
>>>>  		}
>>>>  
>>>> -		flags = inb(base_offset);
>>>> +		flags = inb(base_offset + 1);
>>>>  		borrow = flags & BIT(0);
>>>>  		carry = !!(flags & BIT(1));
>>>>  
>>>>
>> --
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>> 
>