diff options
| author | Takashi Iwai <tiwai@suse.de> | 2016-03-15 15:20:58 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2016-03-16 12:45:32 +0100 |
| commit | 447d6275f0c21f6cc97a88b3a0c601436a4cdf2a (patch) | |
| tree | e2249232cdd129840ef943a3b2136a2205065f25 /sound/usb/endpoint.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/endpoint.c')
| -rw-r--r-- | sound/usb/endpoint.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c index 7b1cb365ffab..c07a7eda42a2 100644 --- a/sound/usb/endpoint.c +++ b/sound/usb/endpoint.c @@ -438,6 +438,9 @@ exit_clear: * * New endpoints will be added to chip->ep_list and must be freed by * calling snd_usb_endpoint_free(). + * + * For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that + * bNumEndpoints > 1 beforehand. */ struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, struct usb_host_interface *alts, |