From: Johan Hovold johan@kernel.org
commit 123a0f125fa3d2104043697baa62899d9e549272 upstream.
The driver was accessing its struct usb_device in its release() callback without holding a reference. This would lead to a use-after-free whenever the device was disconnected while the character device was still open.
Fixes: 66d4bc30d128 ("USB: adutux: remove custom debug macro") Cc: stable stable@vger.kernel.org # 3.12 Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191009153848.8664-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/misc/adutux.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/usb/misc/adutux.c +++ b/drivers/usb/misc/adutux.c @@ -152,6 +152,7 @@ static void adu_delete(struct adu_device kfree(dev->read_buffer_secondary); kfree(dev->interrupt_in_buffer); kfree(dev->interrupt_out_buffer); + usb_put_dev(dev->udev); kfree(dev); }
@@ -680,7 +681,7 @@ static int adu_probe(struct usb_interfac
mutex_init(&dev->mtx); spin_lock_init(&dev->buflock); - dev->udev = udev; + dev->udev = usb_get_dev(udev); init_waitqueue_head(&dev->read_wait); init_waitqueue_head(&dev->write_wait);