summaryrefslogtreecommitdiff
path: root/sound/usb/usbmixer.c
diff options
context:
space:
mode:
Diffstat (limited to 'sound/usb/usbmixer.c')
-rw-r--r--sound/usb/usbmixer.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/sound/usb/usbmixer.c b/sound/usb/usbmixer.c
index f127bfd97c07..539b427d08c6 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;