linux-kernel - Re: [PATCH v3 0/3] ASoC: soundwire: fix port

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Date:   Tue, 1 Sep 2020 09:32:05 +0800
From:   Bard liao <yung-chuan.liao@...ux.intel.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        alsa-devel@...a-project.org, vkoul@...nel.org
Cc:     vinod.koul@...aro.org, tiwai@...e.de, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, ranjani.sridharan@...ux.intel.com,
        hui.wang@...onical.com, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        mengdong.lin@...el.com, sanyog.r.kale@...el.com,
        rander.wang@...ux.intel.com, bard.liao@...el.com
Subject: Re: [PATCH v3 0/3] ASoC: soundwire: fix port_ready[] dynamic
 allocation


On 8/31/2020 11:12 PM, Pierre-Louis Bossart wrote:
>
>
> On 8/30/20 8:27 AM, Bard Liao wrote:
>> The existing code allocates memory for the total number of ports.
>> This only works if the ports are contiguous, but will break if e.g. a
>> Devices uses port0, 1, and 14. The port_ready[] array would contain 3
>> elements, which would lead to an out-of-bounds access. Conversely in
>> other cases, the wrong port index would be used leading to timeouts on
>> prepare.
>>
>> This can be fixed by allocating for the worst-case of 15
>> ports (DP0..DP14). In addition since the number is now fixed, we can
>> use an array instead of a dynamic allocation.
>
> Bard, the order of patches will break git bisect, no? I tried on my 
> side and get the following error after applying patch1
>
> sound/soc/codecs/max98373-sdw.c:337:20: error: assignment to 
> expression with array type
>   337 |  slave->port_ready = devm_kcalloc(&slave->dev, num_of_ports,
>       |
>
> the order should be
>
> ASoC: codecs: soundwire: remove port_ready[] usage from codecs.
> soundwire: add definition for maximum number of ports
> soundwire: fix port_ready[] dynamic allocation in mipi_disco


Thanks Pierre. I will send a new version soon.


>
>> Changes in v3:
>> - Add ASoC tag in the cover letter title.
>> - Edit the title and commit message of the third patch for better
>>    understanding.
>>
>> Changes in v2:
>> - Split patches into sdw and asoc patches. Please note that "soundwire:
>>    fix port_ready[] dynamic allocation in mipi_disco" and "ASoC: codecs:
>>    fix port_ready[] dynamic allocation in ASoC codecs" should be merged
>>    at the same time.
>>
>> Pierre-Louis Bossart (3):
>>    soundwire: add definition for maximum number of ports
>>    soundwire: fix port_ready[] dynamic allocation in mipi_disco
>>    ASoC: codecs: soundwire: remove port_ready[] usage from codecs.
>>
>>   drivers/soundwire/mipi_disco.c  | 18 +-----------------
>>   drivers/soundwire/slave.c       |  4 ++++
>>   include/linux/soundwire/sdw.h   |  5 +++--
>>   sound/soc/codecs/max98373-sdw.c | 15 +--------------
>>   sound/soc/codecs/rt1308-sdw.c   | 14 +-------------
>>   sound/soc/codecs/rt5682-sdw.c   | 15 +--------------
>>   sound/soc/codecs/rt700-sdw.c    | 15 +--------------
>>   sound/soc/codecs/rt711-sdw.c    | 15 +--------------
>>   sound/soc/codecs/rt715-sdw.c    | 33 +--------------------------------
>>   9 files changed, 14 insertions(+), 120 deletions(-)
>>