From 64e759f58f128730b97a3c3a26d283c075ad7c86 Mon Sep 17 00:00:00 2001
From: Szymon Janc <szymon.janc@codecoup.pl>
Date: Mon, 26 Feb 2018 15:41:53 +0100
Subject: [PATCH] Bluetooth: Fix missing encryption refresh on Security Request
Git-commit: 64e759f58f128730b97a3c3a26d283c075ad7c86
Patch-mainline: v4.16-rc7
References: bsc#1051510

If Security Request is received on connection that is already encrypted
with sufficient security master should perform encryption key refresh
procedure instead of just ignoring Slave Security Request
(Core Spec 5.0 Vol 3 Part H 2.4.6).

> ACL Data RX: Handle 3585 flags 0x02 dlen 6
      SMP: Security Request (0x0b) len 1
        Authentication requirement: Bonding, No MITM, SC, No Keypresses (0x09)
< HCI Command: LE Start Encryption (0x08|0x0019) plen 28
        Handle: 3585
        Random number: 0x0000000000000000
        Encrypted diversifier: 0x0000
        Long term key: 44264272a5c426a9e868f034cf0e69f3
> HCI Event: Command Status (0x0f) plen 4
      LE Start Encryption (0x08|0x0019) ncmd 1
        Status: Success (0x00)
> HCI Event: Encryption Key Refresh Complete (0x30) plen 3
        Status: Success (0x00)
        Handle: 3585

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 net/bluetooth/smp.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -2287,8 +2287,14 @@ static u8 smp_cmd_security_req(struct l2
 	else
 		sec_level = authreq_to_seclevel(auth);
 
-	if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
+	if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) {
+		/* If link is already encrypted with sufficient security we
+		 * still need refresh encryption as per Core Spec 5.0 Vol 3,
+		 * Part H 2.4.6
+		 */
+		smp_ltk_encrypt(conn, hcon->sec_level);
 		return 0;
+	}
 
 	if (sec_level > hcon->pending_sec_level)
 		hcon->pending_sec_level = sec_level;