| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 330/667] Bluetooth: use hdev lock in activate_scan for hci_is_adv_monitoring | Date | Tue, 7 Jun 2022 18:59:55 +0200 |
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From: Niels Dossche <dossche.niels@gmail.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@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Sasha Levin <sashal@kernel.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
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