linux-kernel - [PATCH 5.15 330/667] Bluetooth: use hdev lock in activate_scan for hci_is_adv

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Date:   Tue,  7 Jun 2022 18:59:55 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Niels Dossche <dossche.niels@...il.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.15 330/667] Bluetooth: use hdev lock in activate_scan for hci_is_adv_monitoring

From: Niels Dossche <dossche.niels@...il.com>

[ Upstream commit 50a3633ae5e98cf1b80ef5b73c9e341aee9ad896 ]

hci_is_adv_monitoring's function documentation states that it must be
called under the hdev lock. Paths that leads to an unlocked call are:
discov_update => start_discovery => interleaved_discov => active_scan
and: discov_update => start_discovery => active_scan

The solution is to take the lock in active_scan during the duration of
the call to hci_is_adv_monitoring.

Fixes: c32d624640fd ("Bluetooth: disable filter dup when scan for adv monitor")
Signed-off-by: Niels Dossche <dossche.niels@...il.com>
Signed-off-by: Marcel Holtmann <marcel@...tmann.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/bluetooth/hci_request.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/bluetooth/hci_request.c b/net/bluetooth/hci_request.c
index 1d34d330afd3..c2db60ad0f1d 100644
--- a/net/bluetooth/hci_request.c
+++ b/net/bluetooth/hci_request.c
@@ -3174,6 +3174,7 @@ static int active_scan(struct hci_request *req, unsigned long opt)
 	if (err < 0)
 		own_addr_type = ADDR_LE_DEV_PUBLIC;
 
+	hci_dev_lock(hdev);
 	if (hci_is_adv_monitoring(hdev)) {
 		/* Duplicate filter should be disabled when some advertisement
 		 * monitor is activated, otherwise AdvMon can only receive one
@@ -3190,6 +3191,7 @@ static int active_scan(struct hci_request *req, unsigned long opt)
 		 */
 		filter_dup = LE_SCAN_FILTER_DUP_DISABLE;
 	}
+	hci_dev_unlock(hdev);
 
 	hci_req_start_scan(req, LE_SCAN_ACTIVE, interval,
 			   hdev->le_scan_window_discovery, own_addr_type,
-- 
2.35.1