[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>

1 files changed, 1 insertions, 1 deletions

diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index 7b3bf3545a3b..325d4b6b54aa 100644
--- a/sound/usb/usbmixer.c
+++ b/sound/usb/usbmixer.c
@@ -360,7 +360,7 @@ static int get_ctl_value(struct usb_mixer_elem_info *cval, int request, int vali
                                     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;
                 }