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USB: serial: sierra: fix potential deadlock at close

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commit e60870012e 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: 014333f77c ("USB: sierra: fix urb and memory leak on disconnect")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: John Ogness <john.ogness@linutronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[ johan: amend commit message and add fixes and stable tags ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Ogness 2018-06-24 00:32:11 +02:00 committed by Greg Kroah-Hartman
parent 09b56641dd
commit a8587cb96a
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/serial/sierra.c
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@ -790,9 +790,9 @@ static void sierra_close(struct usb_serial_port *port)
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);