linux-kernel - [BUG 0 / 6] L2cap: Spec violations

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Message-ID: <CAJNyHpKpDdps4=QHZ77zu4jfY-NNBcGUrw6UwjuBKfpuSuE__g@mail.gmail.com>
Date:   Thu, 17 Nov 2022 22:52:08 -0500
From:   Sungwoo Kim <iam@...g-woo.kim>
To:     marcel@...tmann.org
Cc:     johan.hedberg@...il.com, luiz.dentz@...il.com, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        linux-bluetooth@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [BUG 0 / 6] L2cap: Spec violations

Hello,
Our fuzzer found six spec violations, illegal state transition.

1. BT_CONNECT2 -> BT_CONFIG by L2CAP_CONN_RSP
2. BT_CONNECT2 -> BT_CONNECTED by L2CAP_CONF_RSP
3. BT_CONNECT2 -> BT_DISCONN by L2CAP_CONF_RSP
4. BT_CONNECTED -> BT_CONFIG by L2CAP_CONN_RSP
5. BT_DISCONN -> BT_CONFIG by L2CAP_CONN_RSP
6. BT_DISCONN -> BT_CONNECTED by L2CAP_CONN_RSP

All expected behaviors are ignoring incoming packets as described in
the spec v5.3 | Vol 3, Part A 6. STATE MACHINE.
Also, I assumed BT_CONNECT2 is corresponding to WAIT_CONNECT in the spec.