Bluetooth: Fix SMP security level when we have no IO capabilities

When the local IO capability is NoInputNoOutput any attempt to convert
the remote authentication requirement to a target security level is
futile. This patch makes sure that we set the target security level at
most to MEDIUM if the local IO capability is NoInputNoOutput.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 10 insertions, 2 deletions

diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index be8371b4eb63..a08b077cb725 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -959,7 +959,11 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
         memcpy(&smp->preq[1], req, sizeof(*req));
         skb_pull(skb, sizeof(*req));
 
-        sec_level = authreq_to_seclevel(auth);
+        if (conn->hcon->io_capability == 0x03)
+                sec_level = BT_SECURITY_MEDIUM;
+        else
+                sec_level = authreq_to_seclevel(auth);
+
         if (sec_level > conn->hcon->pending_sec_level)
                 conn->hcon->pending_sec_level = sec_level;
 
@@ -1165,7 +1169,11 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
 
         auth = rp->auth_req & AUTH_REQ_MASK;
 
-        sec_level = authreq_to_seclevel(auth);
+        if (hcon->io_capability == 0x03)
+                sec_level = BT_SECURITY_MEDIUM;
+        else
+                sec_level = authreq_to_seclevel(auth);
+
         if (smp_sufficient_security(hcon, sec_level))
                 return 0;