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Date:   Mon, 17 Oct 2022 20:30:16 +0000
To:     Zhengchao Shao <>
Subject: Re: [PATCH] Bluetooth: L2CAP: fix use-after-free in l2cap_conn_del()


This patch was applied to bluetooth/bluetooth-next.git (master)
by Luiz Augusto von Dentz <>:

On Mon, 17 Oct 2022 15:58:13 +0800 you wrote:
> When l2cap_recv_frame() is invoked to receive data, and the cid is
> L2CAP_CID_A2MP, if the channel does not exist, it will create a channel.
> However, after a channel is created, the hold operation of the channel
> is not performed. In this case, the value of channel reference counting
> is 1. As a result, after hci_error_reset() is triggered, l2cap_conn_del()
> invokes the close hook function of A2MP to release the channel. Then
>  l2cap_chan_unlock(chan) will trigger UAF issue.
> [...]

Here is the summary with links:
  - Bluetooth: L2CAP: fix use-after-free in l2cap_conn_del()

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