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Bluetooth: use hdev lock for accept_list and reject_list in conn req

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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: a55bd29d52 ("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>
This commit is contained in:
Niels Dossche 2022-04-05 19:37:52 +02:00 committed by Marcel Holtmann
parent 50a3633ae5
commit fb048cae51
1 changed files with 9 additions and 6 deletions
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15
net/bluetooth/hci_event.c
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@ -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)