[2.6.22.2 review 76/84] Hangup TTY before releasing rfcomm_dev

[Greg KH <gregkh@suse.de>]

From: Mikko Rapeli <mikko.rapeli@iki.fi>

The core problem is that RFCOMM socket layer ioctl can release
rfcomm_dev struct while RFCOMM TTY layer is still actively using
it. Calling tty_vhangup() is needed for a synchronous hangup before
rfcomm_dev is freed.

Addresses the oops at http://bugzilla.kernel.org/show_bug.cgi?id=7509

Acked-by: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/bluetooth/rfcomm/tty.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -383,6 +383,10 @@ static int rfcomm_release_dev(void __use
 	if (req.flags & (1 << RFCOMM_HANGUP_NOW))
 		rfcomm_dlc_close(dev->dlc, 0);
 
+	/* Shut down TTY synchronously before freeing rfcomm_dev */
+	if (dev->tty)
+		tty_vhangup(dev->tty);
+
 	rfcomm_dev_del(dev);
 	rfcomm_dev_put(dev);
 	return 0;

-- 
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