From patchwork Fri Jun 11 12:29:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sebastian Urban X-Patchwork-Id: 12315623 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MSGID_FROM_MTA_HEADER,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBB23C48BD1 for ; Fri, 11 Jun 2021 12:29:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5CFA613D3 for ; Fri, 11 Jun 2021 12:29:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231180AbhFKMb0 (ORCPT ); Fri, 11 Jun 2021 08:31:26 -0400 Received: from mail-eopbgr80134.outbound.protection.outlook.com ([40.107.8.134]:14464 "EHLO EUR04-VI1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S230188AbhFKMbZ (ORCPT ); Fri, 11 Jun 2021 08:31:25 -0400 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=kCKPHwsTgAFwX4jMd3cL0d96VUz+1q42Zx4vJPyvR+HtZgmPiaNzf6uwiapflgK8V2EOp3I4htlE6dAbGT7OrIPT4Gb5lDnrGUj538ocGqoFPWtF+iYOx7DGYYsdkqONRMwYAuWsQ283ZkSZCwOlR8wnsRjn0tNHgfPs10aAQgYtqhgaiEMmVVtSoP9LcZA9c3i6BTGSCnXJrxb1oQsaklLEHkw/ERl40OEh+LpJFzPmMuipSiIJsDfRmks7nyXjGZma4GbbG0iZJapaHOfRPA9m4+JuTb0njHveq+foESjW8k89MDTFRL+qlpKUuUk3YbdUMz3CfeJEDzIWQkhY3A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=KIInolZECEth8eIBwckvf6bldey1ZNM171ZCiLHnZco=; b=n4DaIA3Eg10r2G5SvEvDbYpiWCu52YWrSFpxgr0NshsDfqL/2VwaMoHJE31UZF7l7NblPLsSeDr8z51U4pApPZEcbgdfuLX42gqIFnKz8/FnOqmHHL/72dxug3cP/jqvhWMXEIqN1eNGWFA+bVbYcky1ezzHLy5w+JLobpQUrN12U8+hq3hRwkDThey1RkzdF6fGTOeYrxdZ4tO13eV0eOBzSOs3tZExCxh9oMmuN/RllteaE9WkrJaRYZawZwdoeeWwlgKKh3p1pS1EBjHqLWpDo1IP4ix/2TlAYtM4RTNcdrJCwwmYXW8d/Gi3BZ9XyjavynjvzeGM5kG5tQmEkA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=surban.net; dmarc=pass action=none header.from=surban.net; dkim=pass header.d=surban.net; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=surbannet.onmicrosoft.com; s=selector2-surbannet-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=KIInolZECEth8eIBwckvf6bldey1ZNM171ZCiLHnZco=; b=KD50XjEQhBMVH+rHPRiCXLlgceT06EuicdKHOalMu7T9RVon7w8GJi3EAO2gc+v/N5Jhe1yITlp7tFlqTJn9+bnCuLV0XDzPGwFuZGl58oTFMLkOf6ow6nhPlsiPHwKGhuJFiTADCQjuTLNGIVgV0CI3lg7i4v9CztBgSkJz3fM= Authentication-Results: vger.kernel.org; dkim=none (message not signed) header.d=none;vger.kernel.org; dmarc=none action=none header.from=surban.net; Received: from AM9P189MB1730.EURP189.PROD.OUTLOOK.COM (2603:10a6:20b:30c::17) by AM9P189MB1651.EURP189.PROD.OUTLOOK.COM (2603:10a6:20b:30b::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.21; Fri, 11 Jun 2021 12:29:24 +0000 Received: from AM9P189MB1730.EURP189.PROD.OUTLOOK.COM ([fe80::d9c0:8560:388:4ebf]) by AM9P189MB1730.EURP189.PROD.OUTLOOK.COM ([fe80::d9c0:8560:388:4ebf%7]) with mapi id 15.20.4219.021; Fri, 11 Jun 2021 12:29:24 +0000 From: Sebastian Urban To: linux-bluetooth@vger.kernel.org Cc: Sebastian Urban Subject: [PATCH BlueZ] gatt-server: Flush notify multiple buffer when full and fix overflow Date: Fri, 11 Jun 2021 14:29:15 +0200 Message-Id: <20210611122915.21068-1-surban@surban.net> X-Mailer: git-send-email 2.25.1 X-Originating-IP: [24.134.128.129] X-ClientProxiedBy: ZRAP278CA0009.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::19) To AM9P189MB1730.EURP189.PROD.OUTLOOK.COM (2603:10a6:20b:30c::17) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from dino.localdomain (24.134.128.129) by ZRAP278CA0009.CHEP278.PROD.OUTLOOK.COM (2603:10a6:910:10::19) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4219.21 via Frontend Transport; Fri, 11 Jun 2021 12:29:23 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 1d1a6d28-fa6a-4034-2ffb-08d92cd48bbb X-MS-TrafficTypeDiagnostic: AM9P189MB1651: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6430; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM9P189MB1730.EURP189.PROD.OUTLOOK.COM;PTR:;CAT:NONE;SFS:(366004)(396003)(376002)(136003)(39830400003)(346002)(6486002)(26005)(8936002)(38350700002)(2906002)(52116002)(6506007)(6512007)(1076003)(956004)(38100700002)(186003)(66476007)(66556008)(66946007)(16526019)(4326008)(6916009)(86362001)(83380400001)(36756003)(316002)(6666004)(2616005)(107886003)(8676002)(5660300002)(478600001);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: surban.net X-MS-Exchange-CrossTenant-Network-Message-Id: 1d1a6d28-fa6a-4034-2ffb-08d92cd48bbb X-MS-Exchange-CrossTenant-AuthSource: AM9P189MB1730.EURP189.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Jun 2021 12:29:24.0845 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: a27af4ff-c4b3-4dec-be8d-845345d2ab67 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: PBI7Wou82zhLz0ShDHGd1EHtKarLK2fLQ9inkXulwbK/3Bl7qaIxcH3jeb9dyGcpJ6ftR3ZtvFtuc+DjJPShzg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9P189MB1651 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This fixes the calculation of available buffer space in bt_gatt_server_send_notification and sends pending notifications immediately when there is no more room to add a notification. Previously there was a buffer overflow caused by incorrect calculation of available buffer space: data->offset can equal data->len from a previous call to this function, leading (data->len - data->offset) to underflow after data->offset += 2. --- src/shared/gatt-server.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/src/shared/gatt-server.c b/src/shared/gatt-server.c index 970c35f94..d53efe782 100644 --- a/src/shared/gatt-server.c +++ b/src/shared/gatt-server.c @@ -1700,20 +1700,35 @@ bool bt_gatt_server_send_notification(struct bt_gatt_server *server, if (!server || (length && !value)) return false; - if (multiple) + if (multiple) { data = server->nfy_mult; + /* flush buffered data if this request hits buffer size limit */ + if (data && data->offset > 0 && + data->len - data->offset < 4 + length) { + if (server->nfy_mult->id) + timeout_remove(server->nfy_mult->id); + notify_multiple(server); + data = NULL; + } + } + if (!data) { data = new0(struct nfy_mult_data, 1); data->len = bt_att_get_mtu(server->att) - 1; data->pdu = malloc(data->len); } + if (multiple) { + if (data->len - data->offset < 4 + length) + return false; + } else { + if (data->len - data->offset < 2 + length) + return false; + } + put_le16(handle, data->pdu + data->offset); data->offset += 2; - - length = MIN(data->len - data->offset, length); - if (multiple) { put_le16(length, data->pdu + data->offset); data->offset += 2;