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[2620:137:e000::1:20]) by mx.google.com with ESMTP id qa30-20020a170907869e00b007a3fbdb825asi5502527ejc.707.2022.10.24.06.35.27; Mon, 24 Oct 2022 06:36:10 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linuxfoundation.org header.s=korg header.b=xrqWtcc8; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linuxfoundation.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230457AbiJXNVu (ORCPT + 99 others); Mon, 24 Oct 2022 09:21:50 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59420 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236440AbiJXNU2 (ORCPT ); Mon, 24 Oct 2022 09:20:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6B9E86F8C; Mon, 24 Oct 2022 05:28:39 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 60C3D61253; Mon, 24 Oct 2022 11:54:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B1CCC433D7; Mon, 24 Oct 2022 11:54:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666612454; bh=GNw7U/Xkv8pquzbA9AmKaKoga6BkHp1dOGVVlwjeDZo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=xrqWtcc8LjvNFwC9pm8JdCfRyu9cjKCGT6KuaskMDJctIRYg1xVDAAErkMW1aaVvH SJO9v5CXIbqw1cXxN8AEugHmQR0KVSWF3misGeEB145fl6CxUcW1Ots7LykbdKztuQ WZXRX85umg5mdvAO3R5it34CSBPKUIfvsCE1gVeM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Luiz Augusto von Dentz , Hawkins Jiawei , Sasha Levin Subject: [PATCH 4.14 175/210] Bluetooth: hci_sysfs: Fix attempting to call device_add multiple times Date: Mon, 24 Oct 2022 13:31:32 +0200 Message-Id: <20221024113002.634850236@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024112956.797777597@linuxfoundation.org> References: <20221024112956.797777597@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 X-Spam-Status: No, score=-7.6 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_HI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747576234687058444?= X-GMAIL-MSGID: =?utf-8?q?1747576234687058444?= From: Luiz Augusto von Dentz [ Upstream commit 448a496f760664d3e2e79466aa1787e6abc922b5 ] device_add shall not be called multiple times as stated in its documentation: 'Do not call this routine or device_register() more than once for any device structure' Syzkaller reports a bug as follows [1]: ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:33! invalid opcode: 0000 [#1] PREEMPT SMP KASAN [...] Call Trace: __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] kobj_kset_join lib/kobject.c:164 [inline] kobject_add_internal+0x18f/0x8f0 lib/kobject.c:214 kobject_add_varg lib/kobject.c:358 [inline] kobject_add+0x150/0x1c0 lib/kobject.c:410 device_add+0x368/0x1e90 drivers/base/core.c:3452 hci_conn_add_sysfs+0x9b/0x1b0 net/bluetooth/hci_sysfs.c:53 hci_le_cis_estabilished_evt+0x57c/0xae0 net/bluetooth/hci_event.c:6799 hci_le_meta_evt+0x2b8/0x510 net/bluetooth/hci_event.c:7110 hci_event_func net/bluetooth/hci_event.c:7440 [inline] hci_event_packet+0x63d/0xfd0 net/bluetooth/hci_event.c:7495 hci_rx_work+0xae7/0x1230 net/bluetooth/hci_core.c:4007 process_one_work+0x991/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Link: https://syzkaller.appspot.com/bug?id=da3246e2d33afdb92d66bc166a0934c5b146404a Signed-off-by: Luiz Augusto von Dentz Tested-by: Hawkins Jiawei Signed-off-by: Sasha Levin --- net/bluetooth/hci_sysfs.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/bluetooth/hci_sysfs.c b/net/bluetooth/hci_sysfs.c index b568f7c21b30..0c9249339790 100644 --- a/net/bluetooth/hci_sysfs.c +++ b/net/bluetooth/hci_sysfs.c @@ -48,6 +48,9 @@ void hci_conn_add_sysfs(struct hci_conn *conn) BT_DBG("conn %p", conn); + if (device_is_registered(&conn->dev)) + return; + dev_set_name(&conn->dev, "%s:%d", hdev->name, conn->handle); if (device_add(&conn->dev) < 0) {