From patchwork Mon Nov 14 14:22:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuan Can X-Patchwork-Id: 13042429 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9A63C4332F for ; Mon, 14 Nov 2022 14:24:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235873AbiKNOYP (ORCPT ); Mon, 14 Nov 2022 09:24:15 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35776 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236209AbiKNOYN (ORCPT ); Mon, 14 Nov 2022 09:24:13 -0500 Received: from szxga02-in.huawei.com (szxga02-in.huawei.com [45.249.212.188]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AEF969FD9 for ; Mon, 14 Nov 2022 06:24:11 -0800 (PST) Received: from dggpeml500024.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4N9s4D21tmzHvxD; Mon, 14 Nov 2022 22:23:40 +0800 (CST) Received: from huawei.com (10.175.112.208) by dggpeml500024.china.huawei.com (7.185.36.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.31; Mon, 14 Nov 2022 22:24:08 +0800 From: Yuan Can To: , , , , , , , , , CC: Subject: [PATCH v2] net: thunderbolt: Fix error handling in tbnet_init() Date: Mon, 14 Nov 2022 14:22:25 +0000 Message-ID: <20221114142225.74124-1-yuancan@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.175.112.208] X-ClientProxiedBy: dggems703-chm.china.huawei.com (10.3.19.180) To dggpeml500024.china.huawei.com (7.185.36.10) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org A problem about insmod thunderbolt-net failed is triggered with following log given while lsmod does not show thunderbolt_net: insmod: ERROR: could not insert module thunderbolt-net.ko: File exists The reason is that tbnet_init() returns tb_register_service_driver() directly without checking its return value, if tb_register_service_driver() failed, it returns without removing property directory, resulting the property directory can never be created later. tbnet_init() tb_register_property_dir() # register property directory tb_register_service_driver() driver_register() bus_add_driver() priv = kzalloc(...) # OOM happened # return without remove property directory Fix by remove property directory when tb_register_service_driver() returns error. Fixes: e69b6c02b4c3 ("net: Add support for networking over Thunderbolt cable") Signed-off-by: Yuan Can Acked-by: Mika Westerberg --- Changes in v2: - Change to suggested error handling style drivers/net/thunderbolt.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-) diff --git a/drivers/net/thunderbolt.c b/drivers/net/thunderbolt.c index 83fcaeb2ac5e..a52ee2bf5575 100644 --- a/drivers/net/thunderbolt.c +++ b/drivers/net/thunderbolt.c @@ -1391,12 +1391,21 @@ static int __init tbnet_init(void) tb_property_add_immediate(tbnet_dir, "prtcstns", flags); ret = tb_register_property_dir("network", tbnet_dir); - if (ret) { - tb_property_free_dir(tbnet_dir); - return ret; - } + if (ret) + goto err_free_dir; + + ret = tb_register_service_driver(&tbnet_driver); + if (ret) + goto err_unregister; - return tb_register_service_driver(&tbnet_driver); + return 0; + +err_unregister: + tb_unregister_property_dir("network", tbnet_dir); +err_free_dir: + tb_property_free_dir(tbnet_dir); + + return ret; } module_init(tbnet_init);