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Diffstat (limited to 'sound/usb/stream.c')
-rw-r--r--sound/usb/stream.c36
1 files changed, 25 insertions, 11 deletions
diff --git a/sound/usb/stream.c b/sound/usb/stream.c
index 67cf849aa16b..d9e3de495c16 100644
--- a/sound/usb/stream.c
+++ b/sound/usb/stream.c
@@ -596,12 +596,8 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
csep = snd_usb_find_desc(alts->extra, alts->extralen, NULL, USB_DT_CS_ENDPOINT);
if (!csep || csep->bLength < 7 ||
- csep->bDescriptorSubtype != UAC_EP_GENERAL) {
- usb_audio_warn(chip,
- "%u:%d : no or invalid class specific endpoint descriptor\n",
- iface_no, altsd->bAlternateSetting);
- return 0;
- }
+ csep->bDescriptorSubtype != UAC_EP_GENERAL)
+ goto error;
if (protocol == UAC_VERSION_1) {
attributes = csep->bmAttributes;
@@ -609,6 +605,8 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
struct uac2_iso_endpoint_descriptor *csep2 =
(struct uac2_iso_endpoint_descriptor *) csep;
+ if (csep2->bLength < sizeof(*csep2))
+ goto error;
attributes = csep->bmAttributes & UAC_EP_CS_ATTR_FILL_MAX;
/* emulate the endpoint attributes of a v1 device */
@@ -618,12 +616,20 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
struct uac3_iso_endpoint_descriptor *csep3 =
(struct uac3_iso_endpoint_descriptor *) csep;
+ if (csep3->bLength < sizeof(*csep3))
+ goto error;
/* emulate the endpoint attributes of a v1 device */
if (le32_to_cpu(csep3->bmControls) & UAC2_CONTROL_PITCH)
attributes |= UAC_EP_CS_ATTR_PITCH_CONTROL;
}
return attributes;
+
+ error:
+ usb_audio_warn(chip,
+ "%u:%d : no or invalid class specific endpoint descriptor\n",
+ iface_no, altsd->bAlternateSetting);
+ return 0;
}
/* find an input terminal descriptor (either UAC1 or UAC2) with the given
@@ -631,13 +637,17 @@ static int parse_uac_endpoint_attributes(struct snd_usb_audio *chip,
*/
static void *
snd_usb_find_input_terminal_descriptor(struct usb_host_interface *ctrl_iface,
- int terminal_id)
+ int terminal_id, bool uac23)
{
struct uac2_input_terminal_descriptor *term = NULL;
+ size_t minlen = uac23 ? sizeof(struct uac2_input_terminal_descriptor) :
+ sizeof(struct uac_input_terminal_descriptor);
while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
ctrl_iface->extralen,
term, UAC_INPUT_TERMINAL))) {
+ if (term->bLength < minlen)
+ continue;
if (term->bTerminalID == terminal_id)
return term;
}
@@ -655,7 +665,8 @@ snd_usb_find_output_terminal_descriptor(struct usb_host_interface *ctrl_iface,
while ((term = snd_usb_find_csint_desc(ctrl_iface->extra,
ctrl_iface->extralen,
term, UAC_OUTPUT_TERMINAL))) {
- if (term->bTerminalID == terminal_id)
+ if (term->bLength >= sizeof(*term) &&
+ term->bTerminalID == terminal_id)
return term;
}
@@ -729,7 +740,8 @@ snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
format = le16_to_cpu(as->wFormatTag); /* remember the format value */
iterm = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
- as->bTerminalLink);
+ as->bTerminalLink,
+ false);
if (iterm) {
num_channels = iterm->bNrChannels;
chconfig = le16_to_cpu(iterm->wChannelConfig);
@@ -764,7 +776,8 @@ snd_usb_get_audioformat_uac12(struct snd_usb_audio *chip,
* to extract the clock
*/
input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
- as->bTerminalLink);
+ as->bTerminalLink,
+ true);
if (input_term) {
clock = input_term->bCSourceID;
if (!chconfig && (num_channels == input_term->bNrChannels))
@@ -998,7 +1011,8 @@ snd_usb_get_audioformat_uac3(struct snd_usb_audio *chip,
* to extract the clock
*/
input_term = snd_usb_find_input_terminal_descriptor(chip->ctrl_intf,
- as->bTerminalLink);
+ as->bTerminalLink,
+ true);
if (input_term) {
clock = input_term->bCSourceID;
goto found_clock;