linux-kernel - Re: [PATCH v2] Bluetooth: clear the temporary linkkey in hci_conn

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Date:   Thu, 2 Jun 2022 17:24:40 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Alain Michaud <alainmichaud@...gle.com>
Cc:     BlueZ <linux-bluetooth@...r.kernel.org>,
        CrosBT Upstreaming <chromeos-bluetooth-upstreaming@...omium.org>,
        Alain Michaud <alainm@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Paolo Abeni <pabeni@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org
Subject: Re: [PATCH v2] Bluetooth: clear the temporary linkkey in
 hci_conn_cleanup

Hi Alain,

> If a hardware error occurs and the connections are flushed without a
> disconnection_complete event being signaled, the temporary linkkeys are
> not flushed.
> 
> This change ensures that any outstanding flushable linkkeys are flushed
> when the connection are flushed from the hash table.
> 
> Signed-off-by: Alain Michaud <alainm@...omium.org>
> 
> ---
> 
> Changes in v2:
> -Address Feedback from Luiz
> 
> net/bluetooth/hci_conn.c  | 3 +++
> net/bluetooth/hci_event.c | 4 ++--
> 2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
> index 352d7d612128..5911ca0c5239 100644
> --- a/net/bluetooth/hci_conn.c
> +++ b/net/bluetooth/hci_conn.c
> @@ -118,6 +118,9 @@ static void hci_conn_cleanup(struct hci_conn *conn)
> 	if (test_bit(HCI_CONN_PARAM_REMOVAL_PEND, &conn->flags))
> 		hci_conn_params_del(conn->hdev, &conn->dst, conn->dst_type);
> 
> +	if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
> +		hci_remove_link_key(hdev, &conn->dst);
> +
> 	hci_chan_list_flush(conn);
> 
> 	hci_conn_hash_del(hdev, conn);
> diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
> index 6b83f9b0082c..b67fdd1ad8da 100644
> --- a/net/bluetooth/hci_event.c
> +++ b/net/bluetooth/hci_event.c
> @@ -2729,7 +2729,7 @@ static void hci_cs_disconnect(struct hci_dev *hdev, u8 status)
> 	mgmt_conn = test_and_clear_bit(HCI_CONN_MGMT_CONNECTED, &conn->flags);
> 
> 	if (conn->type == ACL_LINK) {
> -		if (test_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
> +		if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
> 			hci_remove_link_key(hdev, &conn->dst);
> 	}
> 
> @@ -3372,7 +3372,7 @@ static void hci_disconn_complete_evt(struct hci_dev *hdev, void *data,
> 				reason, mgmt_connected);
> 
> 	if (conn->type == ACL_LINK) {
> -		if (test_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
> +		if (test_and_clear_bit(HCI_CONN_FLUSH_KEY, &conn->flags))
> 			hci_remove_link_key(hdev, &conn->dst);

do you mind splitting this into two patches. The test_and_clear_bit() change is obviously correct, but it is fix that is not described in the commit message.

Or if you think that it makes sense to keep this together, please add a paragraph about it in the commit message.

Regards

Marcel