[patch 10/40] ALSA: fix selector unit bug affecting some USBspeakerphones

[Greg Kroah-Hartman]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Russ Cox <rsc@xxxxxxxxx>

patch 38977e96cb32e658716e11a05ec7f1fc4618e0f3 in mainline.

[ALSA] fix selector unit bug affecting some USB speakerphones

Following the suggestion in this thread:
https://bugs.launchpad.net/ubuntu/+source/alsa-lib/+bug/26683
the correct upper bound on desc[0] is 5 + num_ins not 6 + num_ins,
because the index used later is 5+i, not 6+i.
This change makes my Vosky Chatterbox speakerphone work.
Apparently it also helps with the Minivox MV100.

Signed-off-by: Russ Cox <rsc@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 sound/usb/usbmixer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -1483,7 +1483,7 @@ static int parse_audio_selector_unit(str
 	struct snd_kcontrol *kctl;
 	char **namelist;
 
-	if (! num_ins || desc[0] < 6 + num_ins) {
+	if (! num_ins || desc[0] < 5 + num_ins) {
 		snd_printk(KERN_ERR "invalid SELECTOR UNIT descriptor %d\n", unitid);
 		return -EINVAL;
 	}

-- 
-
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