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Bluetooth: Fix trying LTK re-encryption when we don't have an LTK

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In the case that the key distribution bits cause us not to generate a
local LTK we should not try to re-encrypt if we're currently encrypted
with an STK. This patch fixes the check for this in the
smp_sufficient_security function.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-07-14 14:34:55 +03:00 committed by Marcel Holtmann
parent eb5a4de80f
commit b2d5e254eb
1 changed files with 5 additions and 2 deletions
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7
net/bluetooth/smp.c
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@ -876,9 +876,12 @@ bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level)
/* If we're encrypted with an STK always claim insufficient
* security. This way we allow the connection to be re-encrypted
* with an LTK, even if the LTK provides the same level of
* security.
* security. Only exception is if we don't have an LTK (e.g.
* because of key distribution bits).
*/
if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags))
if (test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
hci_find_ltk_by_addr(hcon->hdev, &hcon->dst, hcon->dst_type,
hcon->out))
return false;
if (hcon->sec_level >= sec_level)