From mboxrd@z Thu Jan 1 00:00:00 1970 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=-4.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS 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 725DBC07542 for ; Sat, 25 May 2019 18:00:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 51E7A20862 for ; Sat, 25 May 2019 18:00:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727333AbfEYSAa (ORCPT ); Sat, 25 May 2019 14:00:30 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:57478 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726321AbfEYSAa (ORCPT ); Sat, 25 May 2019 14:00:30 -0400 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::3d8]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 7345712B05D2E; Sat, 25 May 2019 11:00:29 -0700 (PDT) Date: Sat, 25 May 2019 11:00:29 -0700 (PDT) Message-Id: <20190525.110029.1339691720534150701.davem@davemloft.net> To: blackgod016574@gmail.com Cc: kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] ipv6_sockglue: Fix a missing-check bug in ip6_ra_control() From: David Miller In-Reply-To: <20190524031946.GA6463@zhanggen-UX430UQ> References: <20190524031946.GA6463@zhanggen-UX430UQ> X-Mailer: Mew version 6.8 on Emacs 26.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Sat, 25 May 2019 11:00:29 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gen Zhang Date: Fri, 24 May 2019 11:19:46 +0800 > In function ip6_ra_control(), the pointer new_ra is allocated a memory > space via kmalloc(). And it is used in the following codes. However, > when there is a memory allocation error, kmalloc() fails. Thus null > pointer dereference may happen. And it will cause the kernel to crash. > Therefore, we should check the return value and handle the error. > > Signed-off-by: Gen Zhang Applied.