diff options
| author | Johan Hovold <johan@kernel.org> | 2021-03-22 16:53:12 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-23 13:27:13 +0100 |
| commit | 4e49bf376c0451ad2eae2592e093659cde12be9a (patch) | |
| tree | 138b949de9f4417136cf34d5d253a52cb4a12b06 /drivers/usb/class | |
| parent | USB: cdc-acm: fix double free on probe failure (diff) | |
| download | linux-4e49bf376c0451ad2eae2592e093659cde12be9a.tar.xz linux-4e49bf376c0451ad2eae2592e093659cde12be9a.zip | |
USB: cdc-acm: fix use-after-free after probe failure
If tty-device registration fails the driver would fail to release the
data interface. When the device is later disconnected, the disconnect
callback would still be called for the data interface and would go about
releasing already freed resources.
Fixes: c93d81955005 ("usb: cdc-acm: fix error handling in acm_probe()")
Cc: stable@vger.kernel.org # 3.9
Cc: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20210322155318.9837-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index d5fbb943c4c1..6decf8f2b9ae 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1516,6 +1516,11 @@ skip_countries: return 0; alloc_fail6: + if (!acm->combined_interfaces) { + /* Clear driver data so that disconnect() returns early. */ + usb_set_intfdata(data_interface, NULL); + usb_driver_release_interface(&acm_driver, data_interface); + } if (acm->country_codes) { device_remove_file(&acm->control->dev, &dev_attr_wCountryCodes); |