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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 3C94FC38A2A for ; Fri, 8 May 2020 12:41:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D8B324968 for ; Fri, 8 May 2020 12:41:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588941668; bh=7WNCl6dTYw0a32ibN6iTf84kdFDF1dAkXtEfvhpDzXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=NiWbufxtsGq1olkwdapov2w60L01y45iMsfcZM6tuxHaicRMAIzkwroPaBVTo3Eal mSe3x2tdxFurX0C0EETq++7VFYQd6fsJBSAnS8Z6jNJ+gyyg4P/gEt1REM7r+PH/S/ tAfBJyc5LHF+ido9vwSG288fbGuoEkNxW+Q7OQcg= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728034AbgEHMlH (ORCPT ); Fri, 8 May 2020 08:41:07 -0400 Received: from mail.kernel.org ([198.145.29.99]:35488 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728779AbgEHMlG (ORCPT ); Fri, 8 May 2020 08:41:06 -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 0040320731; Fri, 8 May 2020 12:41:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588941665; bh=7WNCl6dTYw0a32ibN6iTf84kdFDF1dAkXtEfvhpDzXQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=scxpoMsuj0gBMYe+ltXYc271X98zi1xpczkbHYj3W46aQO/3AdoGEKlOFe08rNbKd y8f13IiB2KDZiJaYEZPutAY8JGVkCqaiZSKutej/eOTinwvTuvrm5IziOPuFW0BJ4Z 9Gc2XSlPrI/6Ko3h+gmgEvf5gLeyBNHKgOoBLJc4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexey Kodanev , Steffen Klassert Subject: [PATCH 4.4 123/312] net/xfrm_input: fix possible NULL deref of tunnel.ip6->parms.i_key Date: Fri, 8 May 2020 14:31:54 +0200 Message-Id: <20200508123133.108492280@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200508123124.574959822@linuxfoundation.org> References: <20200508123124.574959822@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Alexey Kodanev commit 1625f4529957738be7d87cf157e107b8fb9d23b9 upstream. Running LTP 'icmp-uni-basic.sh -6 -p ipcomp -m tunnel' test over openvswitch + veth can trigger kernel panic: BUG: unable to handle kernel NULL pointer dereference at 00000000000000e0 IP: [] xfrm_input+0x82/0x750 ... [] xfrm6_rcv_spi+0x1e/0x20 [] xfrm6_tunnel_rcv+0x42/0x50 [xfrm6_tunnel] [] tunnel6_rcv+0x3e/0x8c [tunnel6] [] ip6_input_finish+0xd5/0x430 [] ip6_input+0x33/0x90 [] ip6_rcv_finish+0xa5/0xb0 ... It seems that tunnel.ip6 can have garbage values and also dereferenced without a proper check, only tunnel.ip4 is being verified. Fix it by adding one more if block for AF_INET6 and initialize tunnel.ip6 with NULL inside xfrm6_rcv_spi() (which is similar to xfrm4_rcv_spi()). Fixes: 049f8e2 ("xfrm: Override skb->mark with tunnel->parm.i_key in xfrm_input") Signed-off-by: Alexey Kodanev Signed-off-by: Steffen Klassert Signed-off-by: Greg Kroah-Hartman --- net/ipv6/xfrm6_input.c | 1 + net/xfrm/xfrm_input.c | 14 +++++++------- 2 files changed, 8 insertions(+), 7 deletions(-) --- a/net/ipv6/xfrm6_input.c +++ b/net/ipv6/xfrm6_input.c @@ -23,6 +23,7 @@ int xfrm6_extract_input(struct xfrm_stat int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi) { + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL; XFRM_SPI_SKB_CB(skb)->family = AF_INET6; XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); return xfrm_input(skb, nexthdr, spi, 0); --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -207,15 +207,15 @@ int xfrm_input(struct sk_buff *skb, int family = XFRM_SPI_SKB_CB(skb)->family; /* if tunnel is present override skb->mark value with tunnel i_key */ - if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) { - switch (family) { - case AF_INET: + switch (family) { + case AF_INET: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4) mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key); - break; - case AF_INET6: + break; + case AF_INET6: + if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6) mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key); - break; - } + break; } /* Allocate new secpath or COW existing one. */