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USB: adutux: fix use-after-free on release 

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: 66d4bc30d1 ("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>
This commit is contained in:
Johan Hovold 2019-10-09 17:38:44 +02:00 committed by Greg Kroah-Hartman
parent 58ecf131e7
commit 123a0f125f
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/misc/adutux.c
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@ -149,6 +149,7 @@ static void adu_delete(struct adu_device *dev)
kfree(dev->read_buffer_secondary); kfree(dev->read_buffer_secondary);
kfree(dev->interrupt_in_buffer); kfree(dev->interrupt_in_buffer);
kfree(dev->interrupt_out_buffer); kfree(dev->interrupt_out_buffer);
usb_put_dev(dev->udev);
kfree(dev); kfree(dev);
} }
@ -664,7 +665,7 @@ static int adu_probe(struct usb_interface *interface,
mutex_init(&dev->mtx); mutex_init(&dev->mtx);
spin_lock_init(&dev->buflock); spin_lock_init(&dev->buflock);
dev->udev = udev; dev->udev = usb_get_dev(udev);
init_waitqueue_head(&dev->read_wait); init_waitqueue_head(&dev->read_wait);
init_waitqueue_head(&dev->write_wait); init_waitqueue_head(&dev->write_wait);