From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 544CF3314CC; Tue, 2 Sep 2025 13:36:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820188; cv=none; b=hjxDCw+duFfBQZsq7gjWfn3m7+/a68stT8+35/nEzaFbeIgVKxpUyxxe7LlVqQOkJmotudZ+YjItIwmPRM2F0d6SIIYOwx5HQ6Bba8vzFr2EsAozXB9eZrPG92SxljNOZIUmfK/JaI19QOaZ//PTrMLjhbIqJN33ZgfEgX3tuq8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756820188; c=relaxed/simple; bh=yn093sx7Ooku1XEMm5dsLWcGYJDnTBzI4UpdOPu02bc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ebt9NFMNlMhzt8M5A3z7/PHJgNTu6f6cz6LyhmOUXQCmglty6+vel0vITH/n6mKMdhdyNRV858z6uOVAEsBpmafbTPX2FwZehP/g8f8Unz59rSJIKKuy3VAG4W7o+T6NDhNofDwii7axiKbYo1TVztrz96m+4LCjDuTxnxHl3W4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=c21dRLaz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="c21dRLaz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBC58C4CEF5; Tue, 2 Sep 2025 13:36:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756820188; bh=yn093sx7Ooku1XEMm5dsLWcGYJDnTBzI4UpdOPu02bc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c21dRLazvqwA7IXJz584eCMoUzFXltyfh8FEnKp/lv6MnmrBFUSn64CQZSpF4xSoP 3N8laooJxWLG0JUHzAHcw+ttX69ZVhTTv+llOgwBWZll5nAx8z8qc1osvRaQ9xykpB /PKvr4sIijf5ikiwh/kjLNaFqbRpEzkLIhNq2tV0= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pavel Shpakovskiy , Paul Menzel , Luiz Augusto von Dentz , Sasha Levin Subject: [PATCH 6.6 25/75] Bluetooth: hci_sync: fix set_local_name race condition Date: Tue, 2 Sep 2025 15:20:37 +0200 Message-ID: <20250902131936.104791082@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250902131935.107897242@linuxfoundation.org> References: <20250902131935.107897242@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pavel Shpakovskiy [ 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 3cb2d10cac930..e2e588b08fe90 100644 --- a/include/net/bluetooth/hci_sync.h +++ b/include/net/bluetooth/hci_sync.h @@ -72,7 +72,7 @@ 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 01aca07707117..020f1809fc994 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 82fa8c28438f2..9b01eaaa0eb2d 100644 --- a/net/bluetooth/mgmt.c +++ b/net/bluetooth/mgmt.c @@ -3819,8 +3819,11 @@ 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); } -- 2.50.1