On Tue, 17 Dec 2024 at 13:39, Benoît Sevens <bsevens@xxxxxxxxxx> wrote:
>
> 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>
> ---
> sound/usb/quirks.c | 28 ++++++++++++++++++----------
> 1 file changed, 18 insertions(+), 10 deletions(-)
>
> diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> index 9d98a0e6a9f4..4c28a27aafdf 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 __free(kfree) = NULL;
> int err;
>
> if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD ||
> @@ -602,15 +602,19 @@ 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));
> err = usb_reset_configuration(dev);
> if (err < 0)
> dev_dbg(&dev->dev, "error usb_reset_configuration: %d\n", err);
> @@ -942,7 +946,7 @@ 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 __free(kfree) = NULL;
> int err;
> u8 bootresponse[0x12];
> int fwsize;
> @@ -977,15 +981,19 @@ 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));
>
> err = usb_reset_configuration(dev);
> if (err < 0)
> --
> 2.47.1.613.gc27f4b7a9f-goog
>
Please disregard, this does not build. I will submit a working patch.
