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Bluetooth: Fix SMP error and response to be mutually exclusive 

Returning failure from the SMP data parsing function will cause an
immediate disconnect, making any attempts to send a response PDU futile.
This patch updates the function to always either send a response or
return an error, but never both at the same time:

* In the case that HCI_LE_ENABLED is not set we want to send a Pairing Not
  Supported response but it is not required to force a disconnection, so
  do not set the error return in this case.

* If we get garbage SMP data we can just fail with the handler function
  instead of also trying to send an SMP Failure PDU.

* There's no reason to force a disconnection if we receive an unknown SMP
  command. Instead simply send a proper Command Not Supported SMP
  response.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Johan Hedberg 2014-08-18 20:33:31 +03:00 committed by Marcel Holtmann
parent b04afa0c28
commit 9b7b18ef1b
1 changed files with 5 additions and 8 deletions
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9
net/bluetooth/smp.c
View File

@ -1430,7 +1430,6 @@ static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
return -EILSEQ; return -EILSEQ;
if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) { if (!test_bit(HCI_LE_ENABLED, &hcon->hdev->dev_flags)) {
err = -EOPNOTSUPP;
reason = SMP_PAIRING_NOTSUPP; reason = SMP_PAIRING_NOTSUPP;
goto done; goto done;
} }
@ -1447,7 +1446,6 @@ static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ && if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ &&
!test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) { !test_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags)) {
BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code); BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code);
reason = SMP_CMD_NOTSUPP;
err = -EOPNOTSUPP; err = -EOPNOTSUPP;
goto done; goto done;
} }
@ -1459,7 +1457,6 @@ static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
case SMP_CMD_PAIRING_FAIL: case SMP_CMD_PAIRING_FAIL:
smp_failure(conn, 0); smp_failure(conn, 0);
reason = 0;
err = -EPERM; err = -EPERM;
break; break;
@ -1501,17 +1498,17 @@ static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
default: default:
BT_DBG("Unknown command code 0x%2.2x", code); BT_DBG("Unknown command code 0x%2.2x", code);
reason = SMP_CMD_NOTSUPP; reason = SMP_CMD_NOTSUPP;
err = -EOPNOTSUPP;
goto done; goto done;
} }
done: done:
if (!err) {
if (reason) if (reason)
smp_failure(conn, reason); smp_failure(conn, reason);
if (!err)
kfree_skb(skb); kfree_skb(skb);
}
return err; return err;
} }