From: Lin Ma Date: Mon, 12 Apr 2021 11:17:57 +0000 (+0800) Subject: bluetooth: eliminate the potential race condition when removing the HCI controller X-Git-Tag: v4.4.271~5 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a7dc1c981038bbd5f7379148d7fd8821d2a7b9ae;p=thirdparty%2Fkernel%2Fstable.git bluetooth: eliminate the potential race condition when removing the HCI controller commit e2cb6b891ad2b8caa9131e3be70f45243df82a80 upstream. There is a possible race condition vulnerability between issuing a HCI command and removing the cont. Specifically, functions hci_req_sync() and hci_dev_do_close() can race each other like below: thread-A in hci_req_sync() | thread-B in hci_dev_do_close() | hci_req_sync_lock(hdev); test_bit(HCI_UP, &hdev->flags); | ... | test_and_clear_bit(HCI_UP, &hdev->flags) hci_req_sync_lock(hdev); | | In this commit we alter the sequence in function hci_req_sync(). Hence, the thread-A cannot issue th. Signed-off-by: Lin Ma Cc: Marcel Holtmann Fixes: 7c6a329e4447 ("[Bluetooth] Fix regression from using default link policy") [iwamatsu: adjust filename, arguments of __hci_req_sync(). CVE-2021-32399] Signed-off-by: Nobuhiro Iwamatsu Signed-off-by: Greg Kroah-Hartman --- diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index cc905a4e57325..81a81b9a3c7d0 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -371,12 +371,17 @@ static int hci_req_sync(struct hci_dev *hdev, { int ret; - if (!test_bit(HCI_UP, &hdev->flags)) - return -ENETDOWN; - /* Serialize all requests */ hci_req_lock(hdev); - ret = __hci_req_sync(hdev, req, opt, timeout); + /* check the state after obtaing the lock to protect the HCI_UP + * against any races from hci_dev_do_close when the controller + * gets removed. + */ + if (test_bit(HCI_UP, &hdev->flags)) + ret = __hci_req_sync(hdev, req, opt, timeout); + else + ret = -ENETDOWN; + hci_req_unlock(hdev); return ret;