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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH v2 1/2] Bluetooth: hci_conn: Fix not cleaning up on LE Connection failure
Date:   Mon, 27 Mar 2023 13:53:46 -0700
Message-Id: <20230327205347.51568-1-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

hci_connect_le_scan_cleanup shall always be invoked to cleanup the
states and re-enable passive scanning if necessary, otherwise it may
cause the pending action to stay active causing multiple attempts to
connect.

Fixes: 9b3628d79b46 ("Bluetooth: hci_sync: Cleanup hci_conn if it cannot be aborted")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/hci_conn.c | 52 +++++++++++++++++++---------------------
 1 file changed, 24 insertions(+), 28 deletions(-)

diff --git a/net/bluetooth/hci_conn.c b/net/bluetooth/hci_conn.c
index 17b946f9ba31..5af3f6b011c9 100644
--- a/net/bluetooth/hci_conn.c
+++ b/net/bluetooth/hci_conn.c
@@ -68,7 +68,7 @@ static const struct sco_param esco_param_msbc[] = {
 };
 
 /* This function requires the caller holds hdev->lock */
-static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
+static void hci_connect_le_scan_cleanup(struct hci_conn *conn, u8 status)
 {
 	struct hci_conn_params *params;
 	struct hci_dev *hdev = conn->hdev;
@@ -88,9 +88,28 @@ static void hci_connect_le_scan_cleanup(struct hci_conn *conn)
 
 	params = hci_pend_le_action_lookup(&hdev->pend_le_conns, bdaddr,
 					   bdaddr_type);
-	if (!params || !params->explicit_connect)
+	if (!params)
 		return;
 
+	if (params->conn) {
+		hci_conn_drop(params->conn);
+		hci_conn_put(params->conn);
+		params->conn = NULL;
+	}
+
+	if (!params->explicit_connect)
+		return;
+
+	/* If the status indicates successful cancellation of
+	 * the attempt (i.e. Unknown Connection Id) there's no point of
+	 * notifying failure since we'll go back to keep trying to
+	 * connect. The only exception is explicit connect requests
+	 * where a timeout + cancel does indicate an actual failure.
+	 */
+	if (status && status != HCI_ERROR_UNKNOWN_CONN_ID)
+		mgmt_connect_failed(hdev, &conn->dst, conn->type,
+				    conn->dst_type, status);
+
 	/* The connection attempt was doing scan for new RPA, and is
 	 * in scan phase. If params are not associated with any other
 	 * autoconnect action, remove them completely. If they are, just unmark
@@ -178,7 +197,7 @@ static void le_scan_cleanup(struct work_struct *work)
 	rcu_read_unlock();
 
 	if (c == conn) {
-		hci_connect_le_scan_cleanup(conn);
+		hci_connect_le_scan_cleanup(conn, 0x00);
 		hci_conn_cleanup(conn);
 	}
 
@@ -1179,31 +1198,8 @@ EXPORT_SYMBOL(hci_get_route);
 static void hci_le_conn_failed(struct hci_conn *conn, u8 status)
 {
 	struct hci_dev *hdev = conn->hdev;
-	struct hci_conn_params *params;
 
-	params = hci_pend_le_action_lookup(&hdev->pend_le_conns, &conn->dst,
-					   conn->dst_type);
-	if (params && params->conn) {
-		hci_conn_drop(params->conn);
-		hci_conn_put(params->conn);
-		params->conn = NULL;
-	}
-
-	/* If the status indicates successful cancellation of
-	 * the attempt (i.e. Unknown Connection Id) there's no point of
-	 * notifying failure since we'll go back to keep trying to
-	 * connect. The only exception is explicit connect requests
-	 * where a timeout + cancel does indicate an actual failure.
-	 */
-	if (status != HCI_ERROR_UNKNOWN_CONN_ID ||
-	    (params && params->explicit_connect))
-		mgmt_connect_failed(hdev, &conn->dst, conn->type,
-				    conn->dst_type, status);
-
-	/* Since we may have temporarily stopped the background scanning in
-	 * favor of connection establishment, we should restart it.
-	 */
-	hci_update_passive_scan(hdev);
+	hci_connect_le_scan_cleanup(conn, status);
 
 	/* Enable advertising in case this was a failed connection
 	 * attempt as a peripheral.
@@ -1240,7 +1236,7 @@ static void create_le_conn_complete(struct hci_dev *hdev, void *data, int err)
 	hci_dev_lock(hdev);
 
 	if (!err) {
-		hci_connect_le_scan_cleanup(conn);
+		hci_connect_le_scan_cleanup(conn, 0x00);
 		goto done;
 	}
 
-- 
2.39.2