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>
diff --git a/sound/usb/format.c b/sound/usb/format.c
index 5367cd1..df5b29fe 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -218,6 +218,12 @@
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,