[alsa-devel] [RFC PATCH 06/40] soundwire: intel: prevent possible dereference in hw_params

[Pierre-Louis Bossart]

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.