From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, John Ogness , Sebastian Andrzej Siewior , Johan Hovold Subject: [PATCH 4.17 26/42] USB: serial: sierra: fix potential deadlock at close Date: Tue, 21 Aug 2018 08:20:58 +0200 Message-Id: <20180821055018.924667755@linuxfoundation.org> In-Reply-To: <20180821055017.596264829@linuxfoundation.org> References: <20180821055017.596264829@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: John Ogness commit e60870012e5a35b1506d7b376fddfb30e9da0b27 upstream. The portdata spinlock can be taken in interrupt context (via sierra_outdat_callback()). Disable interrupts when taking the portdata spinlock when discarding deferred URBs during close to prevent a possible deadlock. Fixes: 014333f77c0b ("USB: sierra: fix urb and memory leak on disconnect") Cc: stable Signed-off-by: John Ogness Signed-off-by: Sebastian Andrzej Siewior [ johan: amend commit message and add fixes and stable tags ] Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/sierra.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/usb/serial/sierra.c +++ b/drivers/usb/serial/sierra.c @@ -770,9 +770,9 @@ static void sierra_close(struct usb_seri kfree(urb->transfer_buffer); usb_free_urb(urb); usb_autopm_put_interface_async(serial->interface); - spin_lock(&portdata->lock); + spin_lock_irq(&portdata->lock); portdata->outstanding_urbs--; - spin_unlock(&portdata->lock); + spin_unlock_irq(&portdata->lock); } sierra_stop_rx_urbs(port);