From patchwork Fri Aug 6 08:54:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Shevchenko X-Patchwork-Id: 12422991 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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 45B51C432BE for ; Fri, 6 Aug 2021 09:00:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A43461159 for ; Fri, 6 Aug 2021 09:00:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S244100AbhHFJBM (ORCPT ); Fri, 6 Aug 2021 05:01:12 -0400 Received: from mga05.intel.com ([192.55.52.43]:22866 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243869AbhHFJBM (ORCPT ); Fri, 6 Aug 2021 05:01:12 -0400 X-IronPort-AV: E=McAfee;i="6200,9189,10067"; a="299924788" X-IronPort-AV: E=Sophos;i="5.84,300,1620716400"; d="scan'208";a="299924788" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Aug 2021 02:00:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.84,300,1620716400"; d="scan'208";a="513320758" Received: from black.fi.intel.com ([10.237.72.28]) by FMSMGA003.fm.intel.com with ESMTP; 06 Aug 2021 02:00:54 -0700 Received: by black.fi.intel.com (Postfix, from userid 1003) id 539FB11C; Fri, 6 Aug 2021 11:54:19 +0300 (EEST) From: Andy Shevchenko To: "David S. Miller" , Sergey Ryazanov , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Loic Poulain , Johannes Berg , Jakub Kicinski , Andy Shevchenko Subject: [PATCH v2 1/2] wwan: core: Avoid returning NULL from wwan_create_dev() Date: Fri, 6 Aug 2021 11:54:12 +0300 Message-Id: <20210806085413.61536-1-andriy.shevchenko@linux.intel.com> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Make wwan_create_dev() to return either valid or error pointer, In some cases it may return NULL. Prevent this by converting it to the respective error pointer. Fixes: 9a44c1cc6388 ("net: Add a WWAN subsystem") Signed-off-by: Andy Shevchenko Acked-by: Sergey Ryazanov Reviewed-by: Loic Poulain --- v2: rewrote to return error pointer, align callers (Loic) drivers/net/wwan/wwan_core.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/net/wwan/wwan_core.c b/drivers/net/wwan/wwan_core.c index 674a81d79db3..35ece98134c0 100644 --- a/drivers/net/wwan/wwan_core.c +++ b/drivers/net/wwan/wwan_core.c @@ -164,11 +164,14 @@ static struct wwan_device *wwan_create_dev(struct device *parent) goto done_unlock; id = ida_alloc(&wwan_dev_ids, GFP_KERNEL); - if (id < 0) + if (id < 0) { + wwandev = ERR_PTR(id); goto done_unlock; + } wwandev = kzalloc(sizeof(*wwandev), GFP_KERNEL); if (!wwandev) { + wwandev = ERR_PTR(-ENOMEM); ida_free(&wwan_dev_ids, id); goto done_unlock; } @@ -182,7 +185,8 @@ static struct wwan_device *wwan_create_dev(struct device *parent) err = device_register(&wwandev->dev); if (err) { put_device(&wwandev->dev); - wwandev = NULL; + wwandev = ERR_PTR(err); + goto done_unlock; } done_unlock: @@ -1014,8 +1018,8 @@ int wwan_register_ops(struct device *parent, const struct wwan_ops *ops, return -EINVAL; wwandev = wwan_create_dev(parent); - if (!wwandev) - return -ENOMEM; + if (IS_ERR(wwandev)) + return PTR_ERR(wwandev); if (WARN_ON(wwandev->ops)) { wwan_remove_dev(wwandev);