[PATCH v3] Bluetooth: clear the temporary linkkey in hci_conn_cleanup

[PATCH v3] Bluetooth: clear the temporary linkkey in hci_conn_cleanup

[Alain Michaud]

From: Alain Michaud <alainm@chromium.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.

Additionally, this also makes use of test_and_clear_bit to avoid
multiple attempts to delete the link key that's already been flushed.

Signed-off-by: Alain Michaud <alainm@chromium.org>

---

Changes in v3:
-Adding test_and_clear_bit to the commit description based on Marcel's
feedback

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

Re: [PATCH v3] Bluetooth: clear the temporary linkkey in hci_conn_cleanup

[patchwork-bot+bluetooth]

Hello:

This patch was applied to bluetooth/bluetooth-next.git (master)
by Marcel Holtmann <marcel@holtmann.org>:

On Thu,  2 Jun 2022 15:30:03 +0000 you wrote:
> From: Alain Michaud <alainm@chromium.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.
> 
> [...]

Here is the summary with links:
  - [v3] Bluetooth: clear the temporary linkkey in hci_conn_cleanup
    https://git.kernel.org/bluetooth/bluetooth-next/c/5a4e1528d840

You are awesome, thank you!
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