Messages in this thread Patch in this message |  | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 18/25] USB: serial: sierra: fix potential deadlock at close | Date | Tue, 21 Aug 2018 08:21:32 +0200 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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From: John Ogness <john.ogness@linutronix.de>
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 <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>
--- 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 @@ -790,9 +790,9 @@ 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);
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