From: Johan Hovold johan@kernel.org
[ Upstream commit 6353001852776e7eeaab4da78922d4c6f2b076af ]
The driver failed to stop its read URB on disconnect, something which could lead to a use-after-free in the completion handler after driver unbind in case the character device has been closed.
Fixes: e7389cc9a7ff ("USB: skel_read really sucks royally") Signed-off-by: Johan Hovold johan@kernel.org Link: https://lore.kernel.org/r/20191009170944.30057-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/usb-skeleton.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/usb/usb-skeleton.c b/drivers/usb/usb-skeleton.c index 7140d06ae04f..baf047c0be6c 100644 --- a/drivers/usb/usb-skeleton.c +++ b/drivers/usb/usb-skeleton.c @@ -575,6 +575,7 @@ static void skel_disconnect(struct usb_interface *interface) dev->disconnected = 1; mutex_unlock(&dev->io_mutex);
+ usb_kill_urb(dev->bulk_in_urb); usb_kill_anchored_urbs(&dev->submitted);
/* decrement our usage count */