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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,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 5EF35C47082 for ; Tue, 8 Jun 2021 19:21:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3D07C61027 for ; Tue, 8 Jun 2021 19:21:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235253AbhFHTXn (ORCPT ); Tue, 8 Jun 2021 15:23:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:54970 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236241AbhFHTLf (ORCPT ); Tue, 8 Jun 2021 15:11:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AA6BD61463; Tue, 8 Jun 2021 18:48:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623178139; bh=pn13S/AjcrIJW3Mi34pVkbRx7C5aq8EKpZpstVbRLD4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RNmcn+I1DU8F4MSDBFQ5JfW8A21EzjciSJ9wri1CDnnX1HanG7gZNz6X71UvUGvtG 38ZtQ86B14aio4oiQ1X8OQoZuHd8tcmP1Klq2xINPjHWwsFkH6GTTPnPvgv6vvDcbo 66iEMyxoMNx2VIZdJO74lE87NfdcK8dMN8QNEk18= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz , "David S. Miller" , Jakub Kicinski , linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, Lin Ma , Hao Xiong Subject: [PATCH 5.12 092/161] Bluetooth: fix the erroneous flush_work() order Date: Tue, 8 Jun 2021 20:27:02 +0200 Message-Id: <20210608175948.557042246@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175945.476074951@linuxfoundation.org> References: <20210608175945.476074951@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lin Ma commit 6a137caec23aeb9e036cdfd8a46dd8a366460e5d upstream. In the cleanup routine for failed initialization of HCI device, the flush_work(&hdev->rx_work) need to be finished before the flush_work(&hdev->cmd_work). Otherwise, the hci_rx_work() can possibly invoke new cmd_work and cause a bug, like double free, in late processings. This was assigned CVE-2021-3564. This patch reorder the flush_work() to fix this bug. Cc: Marcel Holtmann Cc: Johan Hedberg Cc: Luiz Augusto von Dentz Cc: "David S. Miller" Cc: Jakub Kicinski Cc: linux-bluetooth@vger.kernel.org Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Lin Ma Signed-off-by: Hao Xiong Cc: stable Signed-off-by: Marcel Holtmann Signed-off-by: Greg Kroah-Hartman --- net/bluetooth/hci_core.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1608,8 +1608,13 @@ setup_failed: } else { /* Init failed, cleanup */ flush_work(&hdev->tx_work); - flush_work(&hdev->cmd_work); + + /* Since hci_rx_work() is possible to awake new cmd_work + * it should be flushed first to avoid unexpected call of + * hci_cmd_work() + */ flush_work(&hdev->rx_work); + flush_work(&hdev->cmd_work); skb_queue_purge(&hdev->cmd_q); skb_queue_purge(&hdev->rx_q);