5.4-stable review patch. If anyone has any objections, please let me know.
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From: Benoît Sevens bsevens@google.com
commit b909df18ce2a998afef81d58bbd1a05dc0788c40 upstream.
A bogus device can provide a bNumConfigurations value that exceeds the initial value used in usb_get_configuration for allocating dev->config.
This can lead to out-of-bounds accesses later, e.g. in usb_destroy_configuration.
Signed-off-by: Benoît Sevens bsevens@google.com Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@kernel.org Link: https://patch.msgid.link/20241120124144.3814457-1-bsevens@google.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/usb/quirks.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)
--- a/sound/usb/quirks.c +++ b/sound/usb/quirks.c @@ -585,6 +585,7 @@ int snd_usb_create_quirk(struct snd_usb_ 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; int err;
if (le16_to_cpu(get_cfg_desc(config)->wTotalLength) == EXTIGY_FIRMWARE_SIZE_OLD || @@ -596,10 +597,14 @@ static int snd_usb_extigy_boot_quirk(str if (err < 0) dev_dbg(&dev->dev, "error sending boot message: %d\n", err); err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, - &dev->descriptor, sizeof(dev->descriptor)); - config = dev->actconfig; + &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) + dev_dbg(&dev->dev, "error too large bNumConfigurations: %d\n", + new_device_descriptor.bNumConfigurations); + else + 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); @@ -933,6 +938,7 @@ static void mbox2_setup_48_24_magic(stru 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; int err; u8 bootresponse[0x12]; int fwsize; @@ -968,10 +974,14 @@ static int snd_usb_mbox2_boot_quirk(stru dev_dbg(&dev->dev, "device initialised!\n");
err = usb_get_descriptor(dev, USB_DT_DEVICE, 0, - &dev->descriptor, sizeof(dev->descriptor)); - config = dev->actconfig; + &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) + dev_dbg(&dev->dev, "error too large bNumConfigurations: %d\n", + new_device_descriptor.bNumConfigurations); + else + memcpy(&dev->descriptor, &new_device_descriptor, sizeof(dev->descriptor));
err = usb_reset_configuration(dev); if (err < 0) @@ -1018,7 +1028,6 @@ static int snd_usb_axefx3_boot_quirk(str return 0; }
- #define MICROBOOK_BUF_SIZE 128
static int snd_usb_motu_microbookii_communicate(struct usb_device *dev, u8 *buf,