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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Zhengping Jiang <jiangzp@google.com>,
        Luiz Augusto von Dentz <luiz.von.dentz@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 5.19 032/155] Bluetooth: hci_sync: hold hdev->lock when cleanup hci_conn
Date:   Tue,  6 Sep 2022 15:29:40 +0200
Message-Id: <20220906132830.787518784@linuxfoundation.org>
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From: Zhengping Jiang <jiangzp@google.com>

[ Upstream commit 2da8eb834b775a9d1acea6214d3e4a78ac841e6e ]

When disconnecting all devices, hci_conn_failed is used to cleanup
hci_conn object when the hci_conn object cannot be aborted.
The function hci_conn_failed requires the caller holds hdev->lock.

Fixes: 9b3628d79b46f ("Bluetooth: hci_sync: Cleanup hci_conn if it cannot be aborted")
Signed-off-by: Zhengping Jiang <jiangzp@google.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/bluetooth/hci_sync.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c
index 2012f23158839..3b4cee67bbd60 100644
--- a/net/bluetooth/hci_sync.c
+++ b/net/bluetooth/hci_sync.c
@@ -4452,9 +4452,11 @@ static int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn,
 		/* Cleanup hci_conn object if it cannot be cancelled as it
 		 * likelly means the controller and host stack are out of sync.
 		 */
-		if (err)
+		if (err) {
+			hci_dev_lock(hdev);
 			hci_conn_failed(conn, err);
-
+			hci_dev_unlock(hdev);
+		}
 		return err;
 	case BT_CONNECT2:
 		return hci_reject_conn_sync(hdev, conn, reason);
-- 
2.35.1