linux-kernel - Re: [PATCH AUTOSEL 4.14 19/60] iio:core: Fix bug in length of event info_mask and catch unhandled bits set in masks.

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Message-ID: <20190728153843.GH8637@sasha-vm>
Date:   Sun, 28 Jul 2019 11:38:43 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Young Xiao <92siuyang@...il.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 4.14 19/60] iio:core: Fix bug in length of event
 info_mask and catch unhandled bits set in masks.

On Sun, Jul 21, 2019 at 06:27:02PM +0100, Jonathan Cameron wrote:
>On Fri, 19 Jul 2019 00:10:28 -0400
>Sasha Levin <sashal@...nel.org> wrote:
>
>> From: Young Xiao <92siuyang@...il.com>
>>
>> [ Upstream commit 936d3e536dcf88ce80d27bdb637009b13dba6d8c ]
>>
>> The incorrect limit for the for_each_set_bit loop was noticed whilst fixing
>> this other case.  Note that as we only have 3 possible entries a the moment
>> and the value was set to 4, the bug would not have any effect currently.
>> It will bite fairly soon though, so best fix it now.
>>
>> See commit ef4b4856593f ("iio:core: Fix bug in length of event info_mask and
>> catch unhandled bits set in masks.") for details.
>>
>> Signed-off-by: Young Xiao <92siuyang@...il.com>
>> Reviewed-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
>> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>
>As the patch states, this bug doesn't have any impact.  It would only
>be triggered by a buggy driver setting a bit in that mask that makes no
>sense.
>
>So it's good to fix in upstream, but debatable if it's worth porting back
>to stable.
>
>I don't have a strong opinion on this one and again, it should do no
>harm.

I'll drop it then, thanks!

--
Thanks,
Sasha