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Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp
[ Upstream commit 25e97f7b18
]
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@syzkaller.appspotmail.com
Link: https://lore.kernel.org/all/000000000000894f5f05f95e9f4d@google.com/
Signed-off-by: Min Li <lm0963hack@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -4694,7 +4694,6 @@ static inline int l2cap_disconnect_rsp(struct l2cap_conn *conn,
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chan = l2cap_get_chan_by_scid(conn, scid);
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if (!chan) {
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mutex_unlock(&conn->chan_lock);
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return 0;
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}
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