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-rw-r--r--sound/usb/mixer.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 0537c6322990..8e18f7ec51f4 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -204,6 +204,10 @@ static int snd_usb_copy_string_desc(struct mixer_build *state,
int index, char *buf, int maxlen)
{
int len = usb_string(state->chip->dev, index, buf, maxlen - 1);
+
+ if (len < 0)
+ return 0;
+
buf[len] = 0;
return len;
}