Don't bother user space with no input capabilities with confirmation
request.
> ACL Data RX: Handle 3585 flags 0x02 dlen 11
SMP: Pairing Request (0x01) len 6
IO capability: KeyboardDisplay (0x04)
OOB data: Authentication data not present (0x00)
Authentication requirement: Bonding, No MITM, Legacy, No Keypresses (0x01)
Max encryption key size: 16
Initiator key distribution: EncKey IdKey Sign (0x07)
Responder key distribution: EncKey IdKey Sign (0x07)
> HCI Event: LE Meta Event (0x3e) plen 12
LE Read Remote Used Features (0x04)
Status: Unsupported Remote Feature / Unsupported LMP Feature (0x1a)
Handle: 3585
Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
< ACL Data TX: Handle 3585 flags 0x00 dlen 16
LE L2CAP: Connection Parameter Update Request (0x12) ident 1 len 8
Min interval: 24
Max interval: 40
Slave latency: 0
Timeout multiplier: 2000
@ MGMT Event: User Confirmation Request (0x000f) plen 12
LE Address: 4E:29:AB:D8:25:39 (Resolvable)
Confirm hint: 0x01
Value: 0x00000000
< ACL Data TX: Handle 3585 flags 0x00 dlen 11
SMP: Pairing Response (0x02) len 6
IO capability: DisplayOnly (0x00)
OOB data: Authentication data not present (0x00)
Authentication requirement: Bonding, No MITM, Legacy, No Keypresses (0x01)
Max encryption key size: 16
Initiator key distribution: EncKey IdKey Sign (0x07)
Responder key distribution: EncKey Sign (0x05)
Signed-off-by: Grzegorz Kolodziejczyk <grzegorz.kolodziejczyk@xxxxxxxxxxx>
---
net/bluetooth/smp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index ede1a68098f1..cac56153b7b5 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -893,7 +893,8 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
/* Don't bother user space with no IO capabilities */
if (smp->method == JUST_CFM &&
- hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
+ (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT ||
+ hcon->io_capability == HCI_IO_DISPLAY_ONLY))
smp->method = JUST_WORKS;
/* If Just Works, Continue with Zero TK */
--
2.13.6
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