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Bluetooth: Fix encryption key size handling for LTKs

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The encryption key size for LTKs is supposed to be applied only at the
moment of encryption. When generating a Link Key (using LE SC) from
the LTK the full non-shortened value should be used. This patch
modifies the code to always keep the full value around and only apply
the key size when passing the value to HCI.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg
2015-06-08 18:14:39 +03:00
committed by Marcel Holtmann
parent 2eeac87169
commit 8b76ce34c4
4 changed files with 8 additions and 16 deletions
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3
net/bluetooth/hci_event.c
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@@ -4955,7 +4955,8 @@ static void hci_le_ltk_request_evt(struct hci_dev *hdev, struct sk_buff *skb)
goto not_found;
}
memcpy(cp.ltk, ltk->val, sizeof(ltk->val));
memcpy(cp.ltk, ltk->val, ltk->enc_size);
memset(cp.ltk + ltk->enc_size, 0, sizeof(cp.ltk) - ltk->enc_size);
cp.handle = cpu_to_le16(conn->handle);
conn->pending_sec_level = smp_ltk_sec_level(ltk);