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=-6.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 6B59CC04AA6 for ; Tue, 30 Apr 2019 11:46:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3C89821707 for ; Tue, 30 Apr 2019 11:46:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556624771; bh=+ebOXy1Dc42e2ylzFgurqpriBg0nrITmuqCC5h/OTV4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=bFDGapk2whvqM72i6PPSZIGJoAedgYGEFHGXcCMij3AQjW+6gqUnK7ZVsqLOBWTop Vq/RWYGanRomeTkX4G/YLeePdHVOAxKbxeqrKOah5P5Yf3Oa0wYsQhBShauvwEpx9B IcxqL4FgEbeYI+u7SOEeaS0p+ZJwczBleNc/c7Ho= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730109AbfD3LqJ (ORCPT ); Tue, 30 Apr 2019 07:46:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:58688 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730486AbfD3LqE (ORCPT ); Tue, 30 Apr 2019 07:46:04 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5705F21734; Tue, 30 Apr 2019 11:46:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1556624763; bh=+ebOXy1Dc42e2ylzFgurqpriBg0nrITmuqCC5h/OTV4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZORTwAyO9Yl+SkSqB8hnT3gAty2Rau6y6Dl8e+9ySmtz6drZuaQYMuJvigurRII8C Gu/6nU70nMT7g0L5e5KafLq/cpoqcR/9e4fyGAsCdWV2ZG3IMKb+ECY+WwG1zWGdFy zSUUMYMC7xSgv8OrBi9SN/AqKcwCcg2pMzHTeN8o= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot , syzbot , Tetsuo Handa , Santosh Shilimkar , "David S. Miller" Subject: [PATCH 4.19 064/100] net/rds: Check address length before reading address family Date: Tue, 30 Apr 2019 13:38:33 +0200 Message-Id: <20190430113611.844768997@linuxfoundation.org> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190430113608.616903219@linuxfoundation.org> References: <20190430113608.616903219@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tetsuo Handa commit dd3ac9a684358b8c1d5c432ca8322aaf5e4f28ee upstream. syzbot is reporting uninitialized value at rds_connect() [1] and rds_bind() [2]. This is because syzbot is passing ulen == 0 whereas these functions expect that it is safe to access sockaddr->family field in order to determine minimal address length for validation. [1] https://syzkaller.appspot.com/bug?id=f4e61c010416c1e6f0fa3ffe247561b60a50ad71 [2] https://syzkaller.appspot.com/bug?id=a4bf9e41b7e055c3823fdcd83e8c58ca7270e38f Reported-by: syzbot Reported-by: syzbot Signed-off-by: Tetsuo Handa Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/rds/af_rds.c | 3 +++ net/rds/bind.c | 2 ++ 2 files changed, 5 insertions(+) --- a/net/rds/af_rds.c +++ b/net/rds/af_rds.c @@ -506,6 +506,9 @@ static int rds_connect(struct socket *so struct rds_sock *rs = rds_sk_to_rs(sk); int ret = 0; + if (addr_len < offsetofend(struct sockaddr, sa_family)) + return -EINVAL; + lock_sock(sk); switch (uaddr->sa_family) { --- a/net/rds/bind.c +++ b/net/rds/bind.c @@ -173,6 +173,8 @@ int rds_bind(struct socket *sock, struct /* We allow an RDS socket to be bound to either IPv4 or IPv6 * address. */ + if (addr_len < offsetofend(struct sockaddr, sa_family)) + return -EINVAL; if (uaddr->sa_family == AF_INET) { struct sockaddr_in *sin = (struct sockaddr_in *)uaddr;