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Commit e8d0fee7 authored by Daniel Mack's avatar Daniel Mack Committed by Takashi Iwai
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ALSA: usb-audio: fix feature unit parser for UAC2 



Fix a small off-by-one bug which causes the feature unit to announce a
wrong number of channels. This leads to illegal requests sent to the
firmware eventually.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 3ee317fe

sound/usb/mixer.c

+1 −1
Original line number Diff line number Diff line
@@ -1126,7 +1126,7 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void 
	} else {

		struct uac2_feature_unit_descriptor *ftr = _ftr;

		csize = 4;

		channels = (hdr->bLength - 6) / 4;

		channels = (hdr->bLength - 6) / 4 - 1;

		bmaControls = ftr->bmaControls;

	}