ALSA: usb-audio: Add sanity checks for endpoint accesses

[pandora-kernel.git] / sound / usb / clock.c

diff --git a/sound/usb/clock.c b/sound/usb/clock.c
index 5e634a2..4c01f87 100644 (file)
--- a/sound/usb/clock.c
+++ b/sound/usb/clock.c
@@ -211,6 +211,8 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
        unsigned char data[3];
        int err, crate;
 
+       if (get_iface_desc(alts)->bNumEndpoints < 1)
+               return -EINVAL;
        ep = get_endpoint(alts, 0)->bEndpointAddress;
 
        /* if endpoint doesn't have sampling rate control, bail out */