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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. Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=971125 Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -180,6 +180,12 @@ static int create_fixed_stream_quirk(struct snd_usb_audio *chip,
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}
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alts = &iface->altsetting[fp->altset_idx];
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altsd = get_iface_desc(alts);
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if (altsd->bNumEndpoints < 1) {
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kfree(fp);
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kfree(rate_table);
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return -EINVAL;
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}
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fp->protocol = altsd->bInterfaceProtocol;
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if (fp->datainterval == 0)
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