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SubjectRe: [PATCH] ALSA: usb-audio: Fix UAC2 get_ctl request with a RANGE attribute
On 02/07/18 06:45, Takashi Iwai wrote:
> On Mon, 29 Jan 2018 06:37:55 +0100,
> Kirill Marinushkin wrote:
>> The layout of the UAC2 Control request and response varies depending on
>> the request type. With the current implementation, only the Layout 2
>> Parameter Block (with the 2-byte sized RANGE attribute) is handled
>> properly. For the Control requests with the 1-byte sized RANGE attribute
>> (Bass Control, Mid Control, Tremble Control), the response is parsed
>> incorrectly.
>> This commit:
>> * fixes the wLength field value in the request
>> * fixes parsing the range values from the response
>> Fixes: 23caaf19b11e ("ALSA: usb-mixer: Add support for Audio Class v2.0")
>> Signed-off-by: Kirill Marinushkin <>
>> Cc: Jaroslav Kysela <>
>> Cc: Takashi Iwai <>
>> Cc: Jaejoong Kim <>
>> Cc: Bhumika Goyal <>
>> Cc: Stephen Barber <>
>> Cc: Julian Scheel <>
>> Cc:
>> Cc:
> Sorry for the late reply, as I've been (and still) off.
> Does this bug actually hit on any real devices, or is it only a
> logical error so far? In the former case, a Cc to stable is
> mandatory.
> In anyway, I'll review and merge it properly once after I back to
> work.
> thanks,
> Takashi

Hello Takashi,

Thank you for your answer. I will wait until you are back to work, don't
worry about the late replies.

I did not hit the issue on a real device.

During my UAC2 experiments, I reproduced this issue on the development
board, and then tested my solution on it.
Best Regards,

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