From patchwork Wed Mar 24 14:42:20 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wei Yongjun X-Patchwork-Id: 408656 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 06D24C433E1 for ; Wed, 24 Mar 2021 14:33:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C69AA61A15 for ; Wed, 24 Mar 2021 14:33:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236332AbhCXOcv (ORCPT ); Wed, 24 Mar 2021 10:32:51 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:14576 "EHLO szxga04-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236342AbhCXOcj (ORCPT ); Wed, 24 Mar 2021 10:32:39 -0400 Received: from DGGEMS404-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga04-in.huawei.com (SkyGuard) with ESMTP id 4F59d913s2z19Hrb; Wed, 24 Mar 2021 22:30:37 +0800 (CST) Received: from localhost.localdomain (10.175.102.38) by DGGEMS404-HUB.china.huawei.com (10.3.19.204) with Microsoft SMTP Server id 14.3.498.0; Wed, 24 Mar 2021 22:32:25 +0800 From: 'Wei Yongjun To: , Jakub Kicinski , Jiri Pirko CC: , , Hulk Robot Subject: [PATCH net-next] netdevsim: switch to memdup_user_nul() Date: Wed, 24 Mar 2021 14:42:20 +0000 Message-ID: <20210324144220.974575-1-weiyongjun1@huawei.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Originating-IP: [10.175.102.38] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Wei Yongjun Use memdup_user_nul() helper instead of open-coding to simplify the code. Reported-by: Hulk Robot Signed-off-by: Wei Yongjun Reviewed-by: Jakub Kicinski --- drivers/net/netdevsim/health.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c index 21e2974660e7..04aebdf85747 100644 --- a/drivers/net/netdevsim/health.c +++ b/drivers/net/netdevsim/health.c @@ -235,15 +235,10 @@ static ssize_t nsim_dev_health_break_write(struct file *file, char *break_msg; int err; - break_msg = kmalloc(count + 1, GFP_KERNEL); - if (!break_msg) - return -ENOMEM; + break_msg = memdup_user_nul(data, count); + if (IS_ERR(break_msg)) + return PTR_ERR(break_msg); - if (copy_from_user(break_msg, data, count)) { - err = -EFAULT; - goto out; - } - break_msg[count] = '\0'; if (break_msg[count - 1] == '\n') break_msg[count - 1] = '\0';