From patchwork Fri Jun 30 22:09:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Doug Anderson X-Patchwork-Id: 13298799 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E0B3EB64DA for ; Fri, 30 Jun 2023 22:10:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231448AbjF3WKW (ORCPT ); Fri, 30 Jun 2023 18:10:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47314 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230054AbjF3WKV (ORCPT ); Fri, 30 Jun 2023 18:10:21 -0400 Received: from mail-pg1-x52e.google.com (mail-pg1-x52e.google.com [IPv6:2607:f8b0:4864:20::52e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6881A3C29 for ; Fri, 30 Jun 2023 15:10:19 -0700 (PDT) Received: by mail-pg1-x52e.google.com with SMTP id 41be03b00d2f7-55b0e7efb1cso1321008a12.1 for ; Fri, 30 Jun 2023 15:10:19 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1688163019; x=1690755019; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=wJ7kxnAKg6Cu8Pu7Voq9nKWydDnN6Tk0Ch2JNhThoso=; b=aGkPwnLnHayzjcvlPC0S/w8My+uR91LuCAWSxVO4ashAxJ1pmhX/Ebg1wreE5baRh9 ipTQHJK80q1LmoGv4y1dxVHl+x0VkLHjPDlqiD2UnPcXgDWjMXGVQB0KbU1+rBZEHA66 NtBF7MwzFRdjHIb4vortgyayAbaOd2zEvjC9Q= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1688163019; x=1690755019; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=wJ7kxnAKg6Cu8Pu7Voq9nKWydDnN6Tk0Ch2JNhThoso=; b=mD+5z/w0yV/QA6hi4t/aN56Hh51YUBSQpQPiTYYwFD9wLRZUbp2nPPtxkCPHTVGJ6K RkukqvTTG/ePUfOaEWhPLk1Jx+FMybscJdpw4IiIdqZ7ooyKkKdmEwyIdWX2/LzV1TRQ pmXibqfDGrTSsGt+h8ZjMCRJMru9rhlXB5rp9XlSOb//i/fTKR1HzqOLqj9RFKanlRBr SpHlGnoPG1imBlm/v1QKj1+a/+dqSCJrt27vtSqqR9nOCGSZyDQfrLJlpH3BNHP5lf63 VbcVs2EwdqDnaVUR6oTRL5qd47JqEg97fm/ojeaEfWYMC0ygODiVlxAKL961CWX0R+ev dvCw== X-Gm-Message-State: AC+VfDwL72nTBYhxqlTno4ZU3plQEV3/KeojCu8HHinN50gVdxNUQitV sSkswJ+2yiriiZCs2BTtsrO21g== X-Google-Smtp-Source: ACHHUZ5vRSB70zXnWQz1lLVzwVB4LIsI55bIhO5OlwOkZSSgqWm+WZvjUNS+IX5K9D+iEprZUhwVcQ== X-Received: by 2002:a05:6a20:b711:b0:12c:7528:d981 with SMTP id fg17-20020a056a20b71100b0012c7528d981mr2972407pzb.18.1688163018835; Fri, 30 Jun 2023 15:10:18 -0700 (PDT) Received: from tictac2.mtv.corp.google.com ([2620:15c:9d:2:e9c4:8375:7234:e6c2]) by smtp.gmail.com with ESMTPSA id q3-20020a17090311c300b001ac897026cesm11238797plh.102.2023.06.30.15.10.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 30 Jun 2023 15:10:18 -0700 (PDT) From: Douglas Anderson To: Marcel Holtmann , Johan Hedberg , Luiz Augusto von Dentz Cc: Stephen Boyd , Douglas Anderson , Manish Mandlik , Miao-chen Chou , linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 1/2] Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor() Date: Fri, 30 Jun 2023 15:09:06 -0700 Message-ID: <20230630150906.v2.1.I3b7c8905728f3124576361ca35ed28e37f12f5d1@changeid> X-Mailer: git-send-email 2.41.0.255.g8b1d071c50-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org KASAN reports that there's a use-after-free in hci_remove_adv_monitor(). Trawling through the disassembly, you can see that the complaint is from the access in bt_dev_dbg() under the HCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because msft_remove_monitor() can end up freeing the monitor structure. Specifically: hci_remove_adv_monitor() -> msft_remove_monitor() -> msft_remove_monitor_sync() -> msft_le_cancel_monitor_advertisement_cb() -> hci_free_adv_monitor() Moving the printout to before the memory is freed. Fixes: 7cf5c2978f23 ("Bluetooth: hci_sync: Refactor remove Adv Monitor") Signed-off-by: Douglas Anderson --- Changes in v2: - Move the print, don't stash handle in a local. net/bluetooth/hci_core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c index 48917c68358d..7e2ecf8a55d8 100644 --- a/net/bluetooth/hci_core.c +++ b/net/bluetooth/hci_core.c @@ -1980,9 +1980,9 @@ static int hci_remove_adv_monitor(struct hci_dev *hdev, goto free_monitor; case HCI_ADV_MONITOR_EXT_MSFT: - status = msft_remove_monitor(hdev, monitor); bt_dev_dbg(hdev, "%s remove monitor %d msft status %d", hdev->name, monitor->handle, status); + status = msft_remove_monitor(hdev, monitor); break; }