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 k.marinushkin@gmail.com Cc: Jaroslav Kysela perex@perex.cz Cc: Takashi Iwai tiwai@suse.com Cc: Jaejoong Kim climbbb.kim@gmail.com Cc: Bhumika Goyal bhumirks@gmail.com Cc: Stephen Barber smbarber@chromium.org Cc: Julian Scheel julian@jusst.de Cc: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org

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