netdev - [PATCH v2] Bluetooth: clear the temporary linkkey in hci_conn

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Message-Id: <20220602151456.v2.1.I9f2f4ef058af96a5ad610a90c6938ed17a7d103f@changeid>
Date:   Thu,  2 Jun 2022 15:15:03 +0000
From:   Alain Michaud <alainmichaud@...gle.com>
To:     linux-bluetooth@...r.kernel.org
Cc:     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>,
        Marcel Holtmann <marcel@...tmann.org>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH v2] Bluetooth: clear the temporary linkkey in hci_conn_cleanup

From: Alain Michaud <alainm@...omium.org>

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);
 
 		hci_req_update_scan(hdev);
-- 
2.36.1.255.ge46751e96f-goog