diff options
| author | Takashi Iwai | 2016-03-15 15:20:58 +0100 |
|---|---|---|
| committer | Takashi Iwai | 2016-03-16 12:45:32 +0100 |
| commit | 447d6275f0c21f6cc97a88b3a0c601436a4cdf2a (patch) | |
| tree | e2249232cdd129840ef943a3b2136a2205065f25 /sound/usb/mixer_quirks.c | |
| parent | 902eb7fd1e4af3ac69b9b30f8373f118c92b9729 (diff) | |
ALSA: usb-audio: Add sanity checks for endpoint accesses
Add some sanity check codes before actually accessing the endpoint via
get_endpoint() in order to avoid the invalid access through a
malformed USB descriptor. Mostly just checking bNumEndpoints, but in
one place (snd_microii_spdif_default_get()), the validity of iface and
altsetting index is checked as well.
Bugzilla: https://bugzilla.suse.com/show_bug.cgi?id=971125
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/usb/mixer_quirks.c')
| -rw-r--r-- | sound/usb/mixer_quirks.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c index 279025650568..f6c3bf79af9a 100644 --- a/sound/usb/mixer_quirks.c +++ b/sound/usb/mixer_quirks.c @@ -1519,7 +1519,11 @@ static int snd_microii_spdif_default_get(struct snd_kcontrol *kcontrol, /* use known values for that card: interface#1 altsetting#1 */ iface = usb_ifnum_to_if(chip->dev, 1); + if (!iface || iface->num_altsetting < 2) + return -EINVAL; alts = &iface->altsetting[1]; + if (get_iface_desc(alts)->bNumEndpoints < 1) + return -EINVAL; ep = get_endpoint(alts, 0)->bEndpointAddress; err = snd_usb_ctl_msg(chip->dev, |