From 2651657f57e77c36d9a4024c76ccde1d5cf0bcee Mon Sep 17 00:00:00 2001 From: Pavel Shpakovskiy Date: Fri, 22 Aug 2025 12:20:55 +0300 Subject: [PATCH] Bluetooth: hci_sync: fix set_local_name race condition [ Upstream commit 6bbd0d3f0c23fc53c17409dd7476f38ae0ff0cd9 ] Function set_name_sync() uses hdev->dev_name field to send HCI_OP_WRITE_LOCAL_NAME command, but copying from data to hdev->dev_name is called after mgmt cmd was queued, so it is possible that function set_name_sync() will read old name value. This change adds name as a parameter for function hci_update_name_sync() to avoid race condition. Fixes: 6f6ff38a1e14 ("Bluetooth: hci_sync: Convert MGMT_OP_SET_LOCAL_NAME") Signed-off-by: Pavel Shpakovskiy Reviewed-by: Paul Menzel Signed-off-by: Luiz Augusto von Dentz Signed-off-by: Sasha Levin --- include/net/bluetooth/hci_sync.h | 2 +- net/bluetooth/hci_sync.c | 6 +++--- net/bluetooth/mgmt.c | 5 ++++- 3 files changed, 8 insertions(+), 5 deletions(-) diff --git a/include/net/bluetooth/hci_sync.h b/include/net/bluetooth/hci_sync.h index dbabc17b30cdf..17e5112f7840e 100644 --- a/include/net/bluetooth/hci_sync.h +++ b/include/net/bluetooth/hci_sync.h @@ -93,7 +93,7 @@ int hci_update_class_sync(struct hci_dev *hdev); int hci_update_eir_sync(struct hci_dev *hdev); int hci_update_class_sync(struct hci_dev *hdev); -int hci_update_name_sync(struct hci_dev *hdev); +int hci_update_name_sync(struct hci_dev *hdev, const u8 *name); int hci_write_ssp_mode_sync(struct hci_dev *hdev, u8 mode); int hci_get_random_address(struct hci_dev *hdev, bool require_privacy, diff --git a/net/bluetooth/hci_sync.c b/net/bluetooth/hci_sync.c index af86df9de941d..bc2aa514b8c5d 100644 --- a/net/bluetooth/hci_sync.c +++ b/net/bluetooth/hci_sync.c @@ -3491,13 +3491,13 @@ int hci_update_scan_sync(struct hci_dev *hdev) return hci_write_scan_enable_sync(hdev, scan); } -int hci_update_name_sync(struct hci_dev *hdev) +int hci_update_name_sync(struct hci_dev *hdev, const u8 *name) { struct hci_cp_write_local_name cp; memset(&cp, 0, sizeof(cp)); - memcpy(cp.name, hdev->dev_name, sizeof(cp.name)); + memcpy(cp.name, name, sizeof(cp.name)); return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_LOCAL_NAME, sizeof(cp), &cp, @@ -3550,7 +3550,7 @@ int hci_powered_update_sync(struct hci_dev *hdev) hci_write_fast_connectable_sync(hdev, false); hci_update_scan_sync(hdev); hci_update_class_sync(hdev); - hci_update_name_sync(hdev); + hci_update_name_sync(hdev, hdev->dev_name); hci_update_eir_sync(hdev); } diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c index ade93532db34b..8b75647076bae 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -3826,8 +3826,11 @@ static void set_name_complete(struct hci_dev *hdev, void *data, int err) static int set_name_sync(struct hci_dev *hdev, void *data) { + struct mgmt_pending_cmd *cmd = data; + struct mgmt_cp_set_local_name *cp = cmd->param; + if (lmp_bredr_capable(hdev)) { - hci_update_name_sync(hdev); + hci_update_name_sync(hdev, cp->name); hci_update_eir_sync(hdev); } -- 2.47.3