Patch "Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp" has been added to the 6.3-stable tree

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This is a note to let you know that I've just added the patch titled

    Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp

to the 6.3-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bluetooth-l2cap-fix-bad-unlock-balance-in-l2cap_disc.patch
and it can be found in the queue-6.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 6dbaa99e470011bbb27d599efb3a66dcda2b98ea
Author: Min Li <lm0963hack@xxxxxxxxx>
Date:   Mon Apr 17 10:27:54 2023 +0800

    Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp
    
    [ Upstream commit 25e97f7b1866e6b8503be349eeea44bb52d661ce ]
    
    conn->chan_lock isn't acquired before l2cap_get_chan_by_scid,
    if l2cap_get_chan_by_scid returns NULL, then 'bad unlock balance'
    is triggered.
    
    Reported-by: syzbot+9519d6b5b79cf7787cf3@xxxxxxxxxxxxxxxxxxxxxxxxx
    Link: https://lore.kernel.org/all/000000000000894f5f05f95e9f4d@xxxxxxxxxx/
    Signed-off-by: Min Li <lm0963hack@xxxxxxxxx>
    Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 55a7226233f96..24d075282996c 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -4694,7 +4694,6 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
 
 	chan = l2cap_get_chan_by_scid(conn, scid);
 	if (!chan) {
-		mutex_unlock(&conn->chan_lock);
 		return 0;
 	}
 



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