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ALSA: usb-audio: Fix a DMA to stack memory bug

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commit f7d306b47a upstream.

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: b909df18ce ("ALSA: usb-audio: Fix potential out-of-bound accesses for Extigy and Mbox devices")
Cc: stable@kernel.org
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://patch.msgid.link/60e3aa09-039d-46d2-934c-6f123026c2eb@stanley.mountain
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Benoît Sevens <bsevens@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dan Carpenter 2024-12-02 15:57:54 +03:00 committed by Greg Kroah-Hartman
parent b751972c26
commit e7c1fcdda4
1 changed files with 21 additions and 10 deletions
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31
sound/usb/quirks.c
View File

@ -595,7 +595,7 @@ 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 ||
@ -606,15 +606,20 @@ 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);
@ -946,7 +951,7 @@ 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;
@ -981,15 +986,21 @@ 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)