linux-kernel - [PATCH] 6lowpan: Add missing locking

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Date:   Sun, 20 Sep 2020 11:08:26 +0200
From:   Pavel Machek <pavel@...x.de>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        syzbot+96414aa0033c363d8458@...kaller.appspotmail.com,
        koulihong@...wei.com, marcel@...tmann.org
Subject: [PATCH] 6lowpan: Add missing locking

I believe set_lock should be taken in exit function, too.

Signed-off-by: Pavel Machek (CIP) <pavel@...x.de>


diff --git a/net/bluetooth/6lowpan.c b/net/bluetooth/6lowpan.c
index cff4944d5b66..1420734394e9 100644
--- a/net/bluetooth/6lowpan.c
+++ b/net/bluetooth/6lowpan.c
@@ -1301,10 +1301,12 @@ 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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