[ALSA] usbaudio - Coping with short replies in usbmixer
This patch makes sure that short USB replies are treated as an
error when requesting the value of a certain mixer control.
Signed-off-by: Thomas Reitmayr <thomas@devbase.at>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 7b3bf35..325d4b6 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -360,7 +360,7 @@
request,
USB_RECIP_INTERFACE | USB_TYPE_CLASS | USB_DIR_IN,
validx, cval->mixer->ctrlif | (cval->id << 8),
- buf, val_len, 100) >= 0) {
+ buf, val_len, 100) >= val_len) {
*value_ret = convert_signed_value(cval, snd_usb_combine_bytes(buf, val_len));
return 0;
}