lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

ALSA: usb-audio: fix feature unit parser for UAC2

Browse Source 
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: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Daniel Mack
2010-05-27 20:15:14 +02:00
committed by Takashi Iwai
parent 3ee317fe9c
commit e8d0fee70b
1 changed files with 1 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
sound/usb/mixer.c
View File

@@ -1126,7 +1126,7 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid, void
} else { } else {
struct uac2_feature_unit_descriptor *ftr = _ftr; struct uac2_feature_unit_descriptor *ftr = _ftr;
csize = 4; csize = 4;
channels = (hdr->bLength - 6) / 4; channels = (hdr->bLength - 6) / 4 - 1;
bmaControls = ftr->bmaControls; bmaControls = ftr->bmaControls;
} }