From 32b50729d91f0b59336851bf765b9423add00710 Mon Sep 17 00:00:00 2001 From: Alain Michaud Date: Wed, 25 Mar 2020 14:48:34 +0000 Subject: [PATCH] Bluetooth: don't assume key size is 16 when the command fails With this change, the encryption key size is not assumed to be 16 if the read_encryption_key_size command fails for any reason. This ensures that if the controller fails the command for any reason that the encryption key size isn't implicitely set to 16 and instead take a more concervative posture to assume it is 0. Signed-off-by: Alain Michaud Signed-off-by: Marcel Holtmann --- net/bluetooth/hci_event.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index cd3d7d9..0a591be 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -2963,14 +2963,14 @@ static void read_enc_key_size_complete(struct hci_dev *hdev, u8 status, if (!conn) goto unlock; - /* If we fail to read the encryption key size, assume maximum - * (which is the same we do also when this HCI command isn't - * supported. + /* While unexpected, the read_enc_key_size command may fail. The most + * secure approach is to then assume the key size is 0 to force a + * disconnection. */ if (rp->status) { bt_dev_err(hdev, "failed to read key size for handle %u", handle); - conn->enc_key_size = HCI_LINK_KEY_SIZE; + conn->enc_key_size = 0; } else { conn->enc_key_size = rp->key_size; } -- 2.7.4