ALSA: usb-audio: add check for faulty clock in parse_audio_format_rates_v2()

Signed-off-by: Daniel Mack <daniel@caiaq.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/sound/usb/format.c b/sound/usb/format.c
index 5367cd1e52d..df5b29fed00 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -218,6 +218,12 @@ static int parse_audio_format_rates_v2(struct snd_usb_audio *chip,
         int i, nr_rates, data_size, ret = 0;
         int clock = snd_usb_clock_find_source(chip, chip->ctrl_intf, fp->clock);
 
+        if (clock < 0) {
+                snd_printk(KERN_ERR "%s(): unable to find clock source (clock %d)\n",
+                                __func__, clock);
+                goto err;
+        }
+
         /* get the number of sample rates first by only fetching 2 bytes */
         ret = snd_usb_ctl_msg(dev, usb_rcvctrlpipe(dev, 0), UAC2_CS_RANGE,
                               USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_IN,