From patchwork Tue Jun 8 18:27:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 12307903 X-Patchwork-Delegate: kuba@kernel.org 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 C34FAC48BCF for ; Tue, 8 Jun 2021 18:29:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AE195613B6 for ; Tue, 8 Jun 2021 18:29:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234210AbhFHSbo (ORCPT ); Tue, 8 Jun 2021 14:31:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:56008 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234164AbhFHSbS (ORCPT ); Tue, 8 Jun 2021 14:31:18 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id AF6BA613AC; Tue, 8 Jun 2021 18:29:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1623176952; bh=/1mCeOgaUwamvf5jGFid4iJx7VUU0RlW3DOilkc3oGY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fPeX+qDMkP4X0J2CdfSBeAamGUK7kJaPCeDc/EQCufi2wwQMdzoJb+0CL8ESSBBbe cXliuweT/QkkYSbMdnuqSnyc/U06v02kA40dG0foWOh05lvOBJYO/NKFdWN1m0vtn4 HUWqqNzhWmEirz2722frBz9vu9Fh/jTCaeIlvFDs= 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 4.4 09/23] Bluetooth: fix the erroneous flush_work() order Date: Tue, 8 Jun 2021 20:27:01 +0200 Message-Id: <20210608175926.842991911@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210608175926.524658689@linuxfoundation.org> References: <20210608175926.524658689@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@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 @@ -1555,8 +1555,13 @@ static int hci_dev_do_open(struct hci_de } 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);