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| author | Niels Dossche <dossche.niels@gmail.com> | 2022-04-05 19:37:52 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2022-05-13 13:05:49 +0200 |
| commit | fb048cae51bacdfbbda2954af3c213fdb1d484f4 (patch) | |
| tree | 96641604e4a77081c2e4b01add51dc00f1a1642b /net/bluetooth | |
| parent | Bluetooth: use hdev lock in activate_scan for hci_is_adv_monitoring (diff) | |
| download | linux-fb048cae51bacdfbbda2954af3c213fdb1d484f4.tar.xz linux-fb048cae51bacdfbbda2954af3c213fdb1d484f4.zip | |
Bluetooth: use hdev lock for accept_list and reject_list in conn req
All accesses (both reads and modifications) to
hdev->{accept,reject}_list are protected by hdev lock,
except the ones in hci_conn_request_evt. This can cause a race
condition in the form of a list corruption.
The solution is to protect these lists in hci_conn_request_evt as well.
I was unable to find the exact commit that introduced the issue for the
reject list, I was only able to find it for the accept list.
Fixes: a55bd29d5227 ("Bluetooth: Add white list lookup for incoming connection requests")
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/bluetooth')
| -rw-r--r-- | net/bluetooth/hci_event.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 66451661283c..a835ce6f8430 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -3225,10 +3225,12 @@ static void hci_conn_request_evt(struct hci_dev *hdev, void *data, return; } + hci_dev_lock(hdev); + if (hci_bdaddr_list_lookup(&hdev->reject_list, &ev->bdaddr, BDADDR_BREDR)) { hci_reject_conn(hdev, &ev->bdaddr); - return; + goto unlock; } /* Require HCI_CONNECTABLE or an accept list entry to accept the @@ -3240,13 +3242,11 @@ static void hci_conn_request_evt(struct hci_dev *hdev, void *data, !hci_bdaddr_list_lookup_with_flags(&hdev->accept_list, &ev->bdaddr, BDADDR_BREDR)) { hci_reject_conn(hdev, &ev->bdaddr); - return; + goto unlock; } /* Connection accepted */ - hci_dev_lock(hdev); - ie = hci_inquiry_cache_lookup(hdev, &ev->bdaddr); if (ie) memcpy(ie->data.dev_class, ev->dev_class, 3); @@ -3258,8 +3258,7 @@ static void hci_conn_request_evt(struct hci_dev *hdev, void *data, HCI_ROLE_SLAVE); if (!conn) { bt_dev_err(hdev, "no memory for new connection"); - hci_dev_unlock(hdev); - return; + goto unlock; } } @@ -3299,6 +3298,10 @@ static void hci_conn_request_evt(struct hci_dev *hdev, void *data, conn->state = BT_CONNECT2; hci_connect_cfm(conn, 0); } + + return; +unlock: + hci_dev_unlock(hdev); } static u8 hci_to_mgmt_reason(u8 err) |