Hi!
> From: Lihong Kou <koulihong@xxxxxxxxxx>
>
> [ Upstream commit f9c70bdc279b191da8d60777c627702c06e4a37d ]
>
> In the case we set or free the global value listen_chan in
> different threads, we can encounter the UAF problems because
> the method is not protected by any lock, add one to avoid
> this bug.
For this to be safe, bt_6lowpan_exit() needs same handling, no?
Signed-off-by: Pavel Machek (CIP) <pavel@xxxxxxx>
diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index 9a75f9b00b51..2402ef5ac072 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -1304,10 +1304,12 @@ static void __exit bt_6lowpan_exit(void)
debugfs_remove(lowpan_enable_debugfs);
debugfs_remove(lowpan_control_debugfs);
+ mutex_lock(&set_lock);
if (listen_chan) {
l2cap_chan_close(listen_chan, 0);
l2cap_chan_put(listen_chan);
}
+ mutex_unlock(&set_lock);
disconnect_devices();
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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