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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 C3286C56202 for ; Sat, 21 Nov 2020 03:43:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 874A624101 for ; Sat, 21 Nov 2020 03:43:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="sSybWjvw" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726613AbgKUDnc (ORCPT ); Fri, 20 Nov 2020 22:43:32 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42584 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726417AbgKUDnb (ORCPT ); Fri, 20 Nov 2020 22:43:31 -0500 Received: from mail-oi1-x241.google.com (mail-oi1-x241.google.com [IPv6:2607:f8b0:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F5B7C0613CF; Fri, 20 Nov 2020 19:43:30 -0800 (PST) Received: by mail-oi1-x241.google.com with SMTP id j15so7574091oih.4; Fri, 20 Nov 2020 19:43:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Y6px9tXuF4Qgiy8xXoUBm2WM7J/cNcGPuCYetBct2LI=; b=sSybWjvwjuHeA6Epva/SygtwaCF3Sc4tQBSZYgSVt9DnrhYDSAIbluz2Se8MErK1Rb zzj/MOqZvcMwxVFWUX7taHPyDhsPGTj1j8l+ZwLoSncjtrfRvl3K3c7ByUUeI3jUBF+F 9gt1HsmEygPM2SVCtYc9A9mNKwfivbj5/nOYMCz4H355X924BXBb4yflEoE6zmUhJ/8y f213eDE9mxbT3u8lsnPEnYS6mSYNMQOj8NPbZs4qsA+4xzaLg8YRNPj8pxogwli3fT/d ivm0mzcc2LlGcHXhVf2jiS7Sc7Pd44jfpM1sfAd1hDemFYtNxSPJYfNglYnqdfJkoNrr 8H/w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=Y6px9tXuF4Qgiy8xXoUBm2WM7J/cNcGPuCYetBct2LI=; b=Ml6nKcGHnGg0U9orb/8Y0mm6kG8iwxBhflB3GFc/coDr8FBBypRKB/mDHEkQ+6xXDN 1g6o+tb12/QwZ9lp5/+0JoAGE0kycdTmq91KqqZSBNVfUYVG7SF7kpM5IzfDpj4rQdIt z+I3D0Ufr/1SrSBZwxzDKamnKmzr7EnCE/zheM5isR45CDyVjMuyNvKN1krBqx4imluQ C13wNZLUTkccrekVc/iGtqWBbBST6KMH21WecQj6dtga3aqK6K5Vi4RTJm/W2OF4id/+ wdHScwIJadH27IBmljVlE1aVEgSAUmdt+5O8RItm8O0F5jhdlJWxRyx1SSMaPMrSQZL5 HfNw== X-Gm-Message-State: AOAM530TJFxf4+7JSiAonWHV2HDGRSoIIfBo6XgM4ayg/WM0DWNiHHGG gbXvp8spZnEbZ8KGP7wgvbVm3LSOrZBi1w== X-Google-Smtp-Source: ABdhPJyLARdT6fIZbi0FUO/sHDWLPrPIxxj3KJqnv7rGqm8tRcARwx75jmemC7w7ZC6Gn1a105aZqw== X-Received: by 2002:aca:4849:: with SMTP id v70mr8953990oia.103.1605930209314; Fri, 20 Nov 2020 19:43:29 -0800 (PST) Received: from unknown.attlocal.net ([2600:1700:65a0:ab60:c0bb:f8c1:a62c:f78b]) by smtp.gmail.com with ESMTPSA id k63sm2832685oif.12.2020.11.20.19.43.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 20 Nov 2020 19:43:28 -0800 (PST) From: Cong Wang To: netdev@vger.kernel.org Cc: Cong Wang , liuzx@knownsec.com, Florian Westphal , Edward Cree , stable@vger.kernel.org, Greg Kroah-Hartman Subject: [Patch stable] netfilter: clear skb->next in NF_HOOK_LIST() Date: Fri, 20 Nov 2020 19:43:17 -0800 Message-Id: <20201121034317.577081-1-xiyou.wangcong@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Cong Wang NF_HOOK_LIST() uses list_del() to remove skb from the linked list, however, it is not sufficient as skb->next still points to other skb. We should just call skb_list_del_init() to clear skb->next, like the rest places which using skb list. This has been fixed in upstream by commit ca58fbe06c54 ("netfilter: add and use nf_hook_slow_list()"). Fixes: 9f17dbf04ddf ("netfilter: fix use-after-free in NF_HOOK_LIST") Reported-by: liuzx@knownsec.com Tested-by: liuzx@knownsec.com Cc: Florian Westphal Cc: Edward Cree Cc: stable@vger.kernel.org # between 4.19 and 5.4 Cc: Greg Kroah-Hartman Signed-off-by: Cong Wang --- include/linux/netfilter.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/netfilter.h b/include/linux/netfilter.h index 77ebb61faf48..4c0e6539effd 100644 --- a/include/linux/netfilter.h +++ b/include/linux/netfilter.h @@ -316,7 +316,7 @@ NF_HOOK_LIST(uint8_t pf, unsigned int hook, struct net *net, struct sock *sk, INIT_LIST_HEAD(&sublist); list_for_each_entry_safe(skb, next, head, list) { - list_del(&skb->list); + skb_list_del_init(skb); if (nf_hook(pf, hook, net, sk, skb, in, out, okfn) == 1) list_add_tail(&skb->list, &sublist); } -- 2.25.1