diff options
Diffstat (limited to 'sound/usb/usbmixer.c')
| -rw-r--r-- | sound/usb/usbmixer.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c index f127bfd97c0..539b427d08c 100644 --- a/sound/usb/usbmixer.c +++ b/sound/usb/usbmixer.c @@ -470,6 +470,15 @@ static int mixer_vol_tlv(struct snd_kcontrol *kcontrol, int op_flag, */ scale[2] = (convert_signed_value(cval, cval->min) * 100) / 256; scale[3] = (convert_signed_value(cval, cval->max) * 100) / 256; + if (scale[3] <= scale[2]) { + /* something is wrong; assume it's either from/to 0dB */ + if (scale[2] < 0) + scale[3] = 0; + else if (scale[2] > 0) + scale[2] = 0; + else /* totally crap, return an error */ + return -EINVAL; + } if (copy_to_user(_tlv, scale, sizeof(scale))) return -EFAULT; return 0; |