81 lines
2.8 KiB
Diff
81 lines
2.8 KiB
Diff
From 873156565ca67779bbf5a3475ccd08ea3bb92522 Mon Sep 17 00:00:00 2001
|
|
From: Takashi Iwai <tiwai@suse.de>
|
|
Date: Tue, 15 Mar 2016 15:20:58 +0100
|
|
Subject: [PATCH 2/2] 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>
|
|
---
|
|
sound/usb/clock.c | 2 ++
|
|
sound/usb/endpoint.c | 3 +++
|
|
sound/usb/mixer_quirks.c | 4 ++++
|
|
sound/usb/pcm.c | 2 ++
|
|
4 files changed, 11 insertions(+)
|
|
|
|
diff --git a/sound/usb/clock.c b/sound/usb/clock.c
|
|
index 2ed260b10f6d..7ccbcaf6a147 100644
|
|
--- a/sound/usb/clock.c
|
|
+++ b/sound/usb/clock.c
|
|
@@ -285,6 +285,8 @@ static int set_sample_rate_v1(struct snd_usb_audio *chip, int iface,
|
|
unsigned char data[3];
|
|
int err, crate;
|
|
|
|
+ if (get_iface_desc(alts)->bNumEndpoints < 1)
|
|
+ return -EINVAL;
|
|
ep = get_endpoint(alts, 0)->bEndpointAddress;
|
|
|
|
/* if endpoint doesn't have sampling rate control, bail out */
|
|
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
|
|
index e6f71894ecdc..c2131b851602 100644
|
|
--- a/sound/usb/endpoint.c
|
|
+++ b/sound/usb/endpoint.c
|
|
@@ -415,6 +415,9 @@ 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,
|
|
diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
|
|
index d3608c0a29f3..2d724e3c4cc0 100644
|
|
--- a/sound/usb/mixer_quirks.c
|
|
+++ b/sound/usb/mixer_quirks.c
|
|
@@ -1518,7 +1518,11 @@ 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,
|
|
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
|
|
index cdac5179db3f..4da64896df6d 100644
|
|
--- a/sound/usb/pcm.c
|
|
+++ b/sound/usb/pcm.c
|
|
@@ -159,6 +159,8 @@ static int init_pitch_v1(struct snd_usb_audio *chip, int iface,
|
|
unsigned char data[1];
|
|
int err;
|
|
|
|
+ if (get_iface_desc(alts)->bNumEndpoints < 1)
|
|
+ return -EINVAL;
|
|
ep = get_endpoint(alts, 0)->bEndpointAddress;
|
|
|
|
data[0] = 1;
|
|
--
|
|
2.5.0
|
|
|