Commit 0f886ca1 authored by Takashi Iwai's avatar Takashi Iwai
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ALSA: usb-audio: Fix NULL dereference in create_fixed_stream_quirk()

create_fixed_stream_quirk() may cause a NULL-pointer dereference by
accessing the non-existing endpoint when a USB device with a malformed
USB descriptor is used.

This patch avoids it simply by adding a sanity check of bNumEndpoints
before the accesses.


Cc: <>
Signed-off-by: default avatarTakashi Iwai <>
parent b62232d4
......@@ -180,6 +180,12 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
alts = &iface->altsetting[fp->altset_idx];
altsd = get_iface_desc(alts);
if (altsd->bNumEndpoints < 1) {
return -EINVAL;
fp->protocol = altsd->bInterfaceProtocol;
if (fp->datainterval == 0)
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