From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Cyrus-Session-Id: sloti22d1t05-1472218-1518185685-2-17233912146150689185 X-Sieve: CMU Sieve 3.0 X-Spam-known-sender: no X-Spam-score: 0.0 X-Spam-hits: BAYES_00 -1.9, HEADER_FROM_DIFFERENT_DOMAINS 0.001, ME_NOAUTH 0.01, RCVD_IN_DNSWL_HI -5, T_RP_MATCHES_RCVD -0.01, LANGUAGES en, BAYES_USED global, SA_VERSION 3.4.0 X-Spam-source: IP='209.132.180.67', Host='vger.kernel.org', Country='US', FromHeader='org', MailFrom='org' X-Spam-charsets: plain='UTF-8' X-Resolved-to: greg@kroah.com X-Delivered-to: greg@kroah.com X-Mail-from: stable-owner@vger.kernel.org ARC-Seal: i=1; a=rsa-sha256; cv=none; d=messagingengine.com; s=arctest; t=1518185684; b=hwJtOLQg61zdS680S2eHhdf14hb3de69Plpw3Ec59X6Ox5V ng5Wr+MAQvBACV9YWuzDY8qvxJIfo5DT+6wrCLHHAI8QJ6bjTuBopQMtBaMgaR/J R9kVvhr67bkLKLUlqXt86d3aHevBW/ESVKWJah8Azo7vTgmYw7q9wZoGrcfHUa4j 7ojDqlHIOyARYAWNi2sHPFJfWBlnCfwjP6jvetTE6Tl88p+RoJAPS878DWRSZpcq bVwpaITYauBapwZ72plHCzdi9S7d/yHzP4UvEQvnPZDuqj1TuyzMu7PBL971CYAU SVurqbl4hMqUqgadDyzaZc+4VwqQAbVte8yWLpg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=from:to:cc:subject:date:message-id :in-reply-to:references:mime-version:content-type:sender :list-id; s=arctest; t=1518185684; bh=M9+ukb1DoEyGfD0JPBJ5NSLhyp Mch5NeRqRqvl3V10M=; b=n5hh3l5cbtKUeAvMWtfwz6CiyaqICGdIBCB3arK3ib KHQY2eJ8qrxvaHSNV1PtCvd6w9WS5paEgW6eh7OYGpgueyinOcjh34q6mBwxMpIh qwDLisSlsBlKBPJTxRDLgMdGLfZgsujAVanvD+yza4lwVX1tBteEraX3dXF+97fN wPcAnkQba/Zlimv6oVHCedEZK78ehPYT0M16RnUm9po0BKjrK/jTkyEfA6MTIiqR Y0zvZaNqTLcoM0O2ZsTw/tT558zk7cuDmJJaQBcWwHLloAHm9G/L/BQqBjVrsoJA imXOwN4AeoYPCJxrBVVGEOIFVDDVQa9dBc5A8hddUg4Q== ARC-Authentication-Results: i=1; mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Authentication-Results: mx2.messagingengine.com; arc=none (no signatures found); dkim=none (no signatures found); dmarc=none (p=none,has-list-id=yes,d=none) header.from=linuxfoundation.org; iprev=pass policy.iprev=209.132.180.67 (vger.kernel.org); spf=none smtp.mailfrom=stable-owner@vger.kernel.org smtp.helo=vger.kernel.org; x-aligned-from=fail; x-ptr=pass x-ptr-helo=vger.kernel.org x-ptr-lookup=vger.kernel.org; x-return-mx=pass smtp.domain=vger.kernel.org smtp.result=pass smtp_org.domain=kernel.org smtp_org.result=pass smtp_is_org_domain=no header.domain=linuxfoundation.org header.result=pass header_is_org_domain=yes Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752540AbeBINlU (ORCPT ); Fri, 9 Feb 2018 08:41:20 -0500 Received: from mail.linuxfoundation.org ([140.211.169.12]:48484 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752497AbeBINlR (ORCPT ); Fri, 9 Feb 2018 08:41:17 -0500 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Li RongQing , Eric Dumazet , "David S. Miller" Subject: [PATCH 4.9 24/92] tcp: release sk_frag.page in tcp_disconnect Date: Fri, 9 Feb 2018 14:38:53 +0100 Message-Id: <20180209133933.007513827@linuxfoundation.org> X-Mailer: git-send-email 2.16.1 In-Reply-To: <20180209133931.211869118@linuxfoundation.org> References: <20180209133931.211869118@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: stable-owner@vger.kernel.org X-Mailing-List: stable@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Li RongQing [ Upstream commit 9b42d55a66d388e4dd5550107df051a9637564fc ] socket can be disconnected and gets transformed back to a listening socket, if sk_frag.page is not released, which will be cloned into a new socket by sk_clone_lock, but the reference count of this page is increased, lead to a use after free or double free issue Signed-off-by: Li RongQing Cc: Eric Dumazet Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/ipv4/tcp.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -2316,6 +2316,12 @@ int tcp_disconnect(struct sock *sk, int WARN_ON(inet->inet_num && !icsk->icsk_bind_hash); + if (sk->sk_frag.page) { + put_page(sk->sk_frag.page); + sk->sk_frag.page = NULL; + sk->sk_frag.offset = 0; + } + sk->sk_error_report(sk); return err; }