linux-kernel - Re: [alsa-devel] [RFC PATCH 06/40] soundwire: intel: prevent possible dereference in hw

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Date:   Fri, 2 Aug 2019 11:52:26 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        broonie@...nel.org, srinivas.kandagatla@...aro.org,
        jank@...ence.com, slawomir.blauciak@...el.com,
        Sanyog Kale <sanyog.r.kale@...el.com>
Subject: Re: [alsa-devel] [RFC PATCH 06/40] soundwire: intel: prevent possible
 dereference in hw_params



On 8/2/19 10:57 AM, Vinod Koul wrote:
> On 02-08-19, 10:16, Pierre-Louis Bossart wrote:
>>
>>
>> On 8/2/19 6:55 AM, Vinod Koul wrote:
>>> On 25-07-19, 18:39, Pierre-Louis Bossart wrote:
>>>> This should not happen in production systems but we should test for
>>>> all callback arguments before invoking the config_stream callback.
>>>
>>> so you are saying callback arg is mandatory, if so please document that
>>> assumption
>>
>> no, what this says is that if a config_stream is provided then it needs to
>> have a valid argument.
> 
> well typically args are not mandatory..
> 
>> I am not sure what you mean by "document that assumption", comment in the
>> code (where?) or SoundWire documentation?
> 
> The callback documentation which in this is in include/linux/soundwire/sdw_intel.h
> 

/**
  * struct sdw_intel_ops: Intel audio driver callback ops
  *
  * @config_stream: configure the stream with the hw_params
  */
struct sdw_intel_ops {
	int (*config_stream)(void *arg, void *substream,
			     void *dai, void *hw_params, int stream_num);
};

all parameters are mandatory really, not sure what you are trying to get at.