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 <[email protected]>
Signed-off-by: Marcel Holtmann <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Willy Tarreau <[email protected]>
---
net/bluetooth/rfcomm/tty.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index eb2b524..e1b8663 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -381,6 +381,10 @@ static int rfcomm_release_dev(void __user *arg)
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;
--
1.5.2.5
--
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