From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
The usb_get_descriptor() function does DMA so we're not allowed
to use a stack buffer for that. Doing DMA to the stack is not portable
all architectures. Move the "new_device_descriptor" from being stored
on the stack and allocate it with kmalloc() instead.
Fixes: b909df18ce2a ("ALSA: usb-audio: Fix potential out-of-bound accesses for Extigy and Mbox devices")
Cc: stable@xxxxxxxxxx
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Link: https://patch.msgid.link/60e3aa09-039d-46d2-934c-6f123026c2eb@stanley.mountain
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
(cherry picked from commit f7d306b47a24367302bd4fe846854e07752ffcd9)
[Benoît: there is no mbox3 suppport and no __free macro in 5.15]
Signed-off-by: Benoît Sevens <bsevens@xxxxxxxxxx>
---
Changes:
- v2: Remove usage of __free macro which is not yet available in 5.15
sound/usb/quirks.c | 31 +++++++++++++++++++++----------
1 file changed, 21 insertions(+), 10 deletions(-)
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 9d98a0e6a9f4..9f182c448d04 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -591,7 +591,7 @@ int snd_usb_create_quirk(struct snd_usb_audio *chip,
static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interface *intf)
{
struct usb_host_config *config = dev->actconfig;
- struct usb_device_descriptor new_device_descriptor;
+ struct usb_device_descriptor *new_device_descriptor = NULL;
int err;
if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
@@ -602,15 +602,20 @@ static int snd_usb_extigy_boot_quirk(struct usb_device *dev, struct usb_interfac
0x10, 0x43, 0x0001, 0x000a, NULL, 0);
if (err < 0)
dev_dbg(&dev->dev, "error sending boot message: %d\n", err);
+
+ new_device_descriptor = kmalloc(sizeof(*new_device_descriptor), GFP_KERNEL);
+ if (!new_device_descriptor)
+ return -ENOMEM;
err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
- &new_device_descriptor, sizeof(new_device_descriptor));
+ new_device_descriptor, sizeof(*new_device_descriptor));
if (err < 0)
dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
- if (new_device_descriptor.bNumConfigurations > dev->descriptor.bNumConfigurations)
+ if (new_device_descriptor->bNumConfigurations > dev->descriptor.bNumConfigurations)
dev_dbg(&dev->dev, "error too large bNumConfigurations: %d\n",
- new_device_descriptor.bNumConfigurations);
+ new_device_descriptor->bNumConfigurations);
else
- memcpy(&dev->descriptor, &new_device_descriptor, sizeof(dev->descriptor));
+ memcpy(&dev->descriptor, new_device_descriptor, sizeof(dev->descriptor));
+ kfree(new_device_descriptor);
err = usb_reset_configuration(dev);
if (err < 0)
dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
@@ -942,7 +947,7 @@ static void mbox2_setup_48_24_magic(struct usb_device *dev)
static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
{
struct usb_host_config *config = dev->actconfig;
- struct usb_device_descriptor new_device_descriptor;
+ struct usb_device_descriptor *new_device_descriptor = NULL;
int err;
u8 bootresponse[0x12];
int fwsize;
@@ -977,15 +982,21 @@ static int snd_usb_mbox2_boot_quirk(struct usb_device *dev)
dev_dbg(&dev->dev, "device initialised!\n");
+ new_device_descriptor = kmalloc(sizeof(*new_device_descriptor), GFP_KERNEL);
+ if (!new_device_descriptor)
+ return -ENOMEM;
+
err = usb_get_descriptor(dev, USB_DT_DEVICE, 0,
- &new_device_descriptor, sizeof(new_device_descriptor));
+ new_device_descriptor, sizeof(*new_device_descriptor));
if (err < 0)
dev_dbg(&dev->dev, "error usb_get_descriptor: %d\n", err);
- if (new_device_descriptor.bNumConfigurations > dev->descriptor.bNumConfigurations)
+ if (new_device_descriptor->bNumConfigurations > dev->descriptor.bNumConfigurations)
dev_dbg(&dev->dev, "error too large bNumConfigurations: %d\n",
- new_device_descriptor.bNumConfigurations);
+ new_device_descriptor->bNumConfigurations);
else
- memcpy(&dev->descriptor, &new_device_descriptor, sizeof(dev->descriptor));
+ memcpy(&dev->descriptor, new_device_descriptor, sizeof(dev->descriptor));
+
+ kfree(new_device_descriptor);
err = usb_reset_configuration(dev);
if (err < 0)
--
2.47.1.613.gc27f4b7a9f-goog
