From e4b019515f950b4e6e5b74b2e1bb03a90cb33039 Mon Sep 17 00:00:00 2001
From: Kai-Heng Feng <kai.heng.feng@canonical.com>
Date: Thu, 25 Jan 2024 14:50:28 +0800
Subject: [PATCH] Bluetooth: Enforce validation on max value of connection interval
Git-commit: e4b019515f950b4e6e5b74b2e1bb03a90cb33039
Patch-mainline: v6.8-rc7
References: git-fixes
Right now Linux BT stack cannot pass test case "GAP/CONN/CPUP/BV-05-C
'Connection Parameter Update Procedure Invalid Parameters Central
Responder'" in Bluetooth Test Suite revision GAP.TS.p44. [0]
That was revoled by commit c49a8682fc5d ("Bluetooth: validate BLE
connection interval updates"), but later got reverted due to devices
like keyboards and mice may require low connection interval.
So only validate the max value connection interval to pass the Test
Suite, and let devices to request low connection interval if needed.
[0] https://www.bluetooth.org/docman/handlers/DownloadDoc.ashx?doc_id=229869
Fixes: 68d19d7d9957 ("Revert "Bluetooth: validate BLE connection interval updates"")
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
net/bluetooth/hci_event.c | 4 ++++
net/bluetooth/l2cap_core.c | 8 +++++++-
2 files changed, 11 insertions(+), 1 deletion(-)
diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index 613f2fd0bcc1..2a5f5a7d2412 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -6797,6 +6797,10 @@ static void hci_le_remote_conn_param_req_evt(struct hci_dev *hdev, void *data,
return send_conn_param_neg_reply(hdev, handle,
HCI_ERROR_UNKNOWN_CONN_ID);
+ if (max > hcon->le_conn_max_interval)
+ return send_conn_param_neg_reply(hdev, handle,
+ HCI_ERROR_INVALID_LL_PARAMS);
+
if (hci_check_conn_params(min, max, latency, timeout))
return send_conn_param_neg_reply(hdev, handle,
HCI_ERROR_INVALID_LL_PARAMS);
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 60298975d5c4..656f49b299d2 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -5613,7 +5613,13 @@ static inline int l2cap_conn_param_update_req(struct l2cap_conn *conn,
memset(&rsp, 0, sizeof(rsp));
- err = hci_check_conn_params(min, max, latency, to_multiplier);
+ if (max > hcon->le_conn_max_interval) {
+ BT_DBG("requested connection interval exceeds current bounds.");
+ err = -EINVAL;
+ } else {
+ err = hci_check_conn_params(min, max, latency, to_multiplier);
+ }
+
if (err)
rsp.result = cpu_to_le16(L2CAP_CONN_PARAM_REJECTED);
else
--
2.35.3