From mboxrd@z Thu Jan 1 00:00:00 1970 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 1BB3DC07E9B for ; Wed, 21 Jul 2021 11:31:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7A8160FD7 for ; Wed, 21 Jul 2021 11:31:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238653AbhGUKsx (ORCPT ); Wed, 21 Jul 2021 06:48:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238551AbhGUJgx (ORCPT ); Wed, 21 Jul 2021 05:36:53 -0400 Received: from mail-pg1-x536.google.com (mail-pg1-x536.google.com [IPv6:2607:f8b0:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 392B8C0613E3; Wed, 21 Jul 2021 03:17:29 -0700 (PDT) Received: by mail-pg1-x536.google.com with SMTP id j73so1441000pge.1; Wed, 21 Jul 2021 03:17:29 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=GmFXEsAxbG8KZfMM+UsqBDrbJkHUFiGmqFsibv1XO4g=; b=Fx32sue3mQepTLN9Ttrt6nLPas35qhyRkAnEpea2Mouer4p+Cp6rthrsL0RXkc9o1M s4xuwkH74RNoERSESufIhVW5eNQj38mMmrHQXEDWSVGjLfLVy2TSkuvNab0maOwEyAmH vhtKcsVhXIv3VHE2dy7Bxv3e2XjJSjApiub4YZQWmmJ3hpaLjd4pxLNhfMeBjBfkFE6G wcs16zGFHsiqGI2ZwZeZ7hjkkP8Xgozod55VlGfbMi6U4GR0+/ul1sFKsHzpeZ/Mw/kQ 1RbnVd1EOtTJRIQcbHlan6TIBFQKtiHCYvWczkApNzkSqtUKeY9mFElQvgqpoxLK/XyU 8Mzw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=GmFXEsAxbG8KZfMM+UsqBDrbJkHUFiGmqFsibv1XO4g=; b=llkvxkCmvQAILRG42cjdegu0GrLXO4MGeMtASaEHZM4Enxvi2ZOiHCoYpmk/VPbd5J +FFivlWTMry8WjXRdABo9fy3QEEWVOgZgoBggq+XboymfeFf3lsD7z7kGOwCE0TGFoDg ZwJM6em0t5yxx5qMAmrYUnUQnqJYwz70kjepwxS0qkY2SlPw+MHQ2SVF1dtUygKO/lOD VWbmy0bNnlCOCiw9llYMkfMPNbVogeisrFxp2aSwZM1YBqxVlrKfK7Csw2uoDBdLzdaD f3dOY2k8EJJwqOiSTephpZDWBGtMUNyY2awwVPAJ3lhye6pRRGFrieZ43MbfcvYyijiu tjPQ== X-Gm-Message-State: AOAM531JwknIZkSX/Akn6w40zZLRvclfTWXsZfTlsxSDLSogUKVcit/1 IHh9L0Y7Qg9WcrlZXLfPyHtubP8nmoqEVIFRMEQ= X-Google-Smtp-Source: ABdhPJxabd+8ymM2NRg2/JRi5E0kd2wtw9dI2cxAd5OZTNoNwxYd09wBP09f+o8F+RdDtGAnclFeIQ== X-Received: by 2002:a62:160a:0:b029:328:56b9:b1ee with SMTP id 10-20020a62160a0000b029032856b9b1eemr36090473pfw.52.1626862648751; Wed, 21 Jul 2021 03:17:28 -0700 (PDT) Received: from localhost.localdomain ([118.200.190.93]) by smtp.gmail.com with ESMTPSA id p33sm26481068pfw.40.2021.07.21.03.17.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Jul 2021 03:17:28 -0700 (PDT) From: Desmond Cheong Zhi Xi To: marcel@holtmann.org, johan.hedberg@gmail.com, luiz.dentz@gmail.com, davem@davemloft.net, kuba@kernel.org Cc: Desmond Cheong Zhi Xi , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, skhan@linuxfoundation.org, gregkh@linuxfoundation.org, linux-kernel-mentees@lists.linuxfoundation.org, syzbot+66264bf2fd0476be7e6c@syzkaller.appspotmail.com Subject: [PATCH] Bluetooth: skip invalid hci_sync_conn_complete_evt Date: Wed, 21 Jul 2021 18:17:10 +0800 Message-Id: <20210721101710.82974-1-desmondcheongzx@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org Syzbot reported a corrupted list in kobject_add_internal [1]. This happens when multiple HCI_EV_SYNC_CONN_COMPLETE event packets with status 0 are sent for the same HCI connection. This causes us to register the device more than once which corrupts the kset list. To fix this, in hci_sync_conn_complete_evt, we check whether we're trying to process the same HCI_EV_SYNC_CONN_COMPLETE event multiple times for one connection. If that's the case, the event is invalid, so we skip further processing and exit. Link: https://syzkaller.appspot.com/bug?extid=66264bf2fd0476be7e6c [1] Reported-by: syzbot+66264bf2fd0476be7e6c@syzkaller.appspotmail.com Tested-by: syzbot+66264bf2fd0476be7e6c@syzkaller.appspotmail.com Signed-off-by: Desmond Cheong Zhi Xi --- net/bluetooth/hci_event.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c index 016b2999f219..091a92338492 100644 --- a/net/bluetooth/hci_event.c +++ b/net/bluetooth/hci_event.c @@ -4373,6 +4373,8 @@ static void hci_sync_conn_complete_evt(struct hci_dev *hdev, switch (ev->status) { case 0x00: + if (conn->state == BT_CONNECTED) + goto unlock; /* Already connected, event not valid */ conn->handle = __le16_to_cpu(ev->handle); conn->state = BT_CONNECTED; conn->type = ev->link_type; -- 2.25.1