Bluetooth: Classic: SMP: Store derived LK if SMP_FLAG_BOND is set

When deriving the new LK, remove the old LK if it exists.

Store the derived LK if the flag `SMP_FLAG_BOND` of LE SMP is set.

Signed-off-by: Lyle Zhu <[email protected]>

Author: lylezhu2012

subsys/bluetooth/host/smp.c

@@ -810,6 +810,12 @@ static void sc_derive_link_key(struct bt_smp *smp)
 		return;
 	}
 
+	/* Remove the bonding information */
+	link_key = bt_keys_find_link_key(&conn->le.dst.a);
+	if (link_key != NULL) {
+		bt_keys_link_key_clear(link_key);
+	}
+
 	/*
 	 * At this point remote device identity is known so we can use
 	 * destination address here
@@ -855,6 +861,11 @@ static void sc_derive_link_key(struct bt_smp *smp)
 	} else {
 		link_key->flags &= ~BT_LINK_KEY_AUTHENTICATED;
 	}
+
+	if (atomic_test_bit(smp->flags, SMP_FLAG_BOND)) {
+		/* Store the link key */
+		bt_keys_link_key_store(link_key);
+	}
 }
 
 static void smp_br_reset(struct bt_smp_br *smp)