From owner-svn-src-all@freebsd.org Thu Nov 5 22:41:55 2020 Return-Path: Delivered-To: svn-src-all@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 821062D26FF; Thu, 5 Nov 2020 22:41:55 +0000 (UTC) (envelope-from melifaro@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4CRz6C3HW3z3kr9; Thu, 5 Nov 2020 22:41:55 +0000 (UTC) (envelope-from melifaro@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 63B451AF56; Thu, 5 Nov 2020 22:41:55 +0000 (UTC) (envelope-from melifaro@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 0A5MftVr018788; Thu, 5 Nov 2020 22:41:55 GMT (envelope-from melifaro@FreeBSD.org) Received: (from melifaro@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 0A5MftxO018787; Thu, 5 Nov 2020 22:41:55 GMT (envelope-from melifaro@FreeBSD.org) Message-Id: <202011052241.0A5MftxO018787@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: melifaro set sender to melifaro@FreeBSD.org using -f From: "Alexander V. Chernikov" Date: Thu, 5 Nov 2020 22:41:55 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r367402 - stable/12/sys/netinet6 X-SVN-Group: stable-12 X-SVN-Commit-Author: melifaro X-SVN-Commit-Paths: stable/12/sys/netinet6 X-SVN-Commit-Revision: 367402 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 05 Nov 2020 22:41:55 -0000 Author: melifaro Date: Thu Nov 5 22:41:54 2020 New Revision: 367402 URL: https://svnweb.freebsd.org/changeset/base/367402 Log: MFC r367114. Fix use-after-free in icmp6_notify_error(). Reported by: Maxime Villard Modified: stable/12/sys/netinet6/icmp6.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet6/icmp6.c ============================================================================== --- stable/12/sys/netinet6/icmp6.c Thu Nov 5 22:35:45 2020 (r367401) +++ stable/12/sys/netinet6/icmp6.c Thu Nov 5 22:41:54 2020 (r367402) @@ -912,6 +912,7 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp } icmp6 = (struct icmp6_hdr *)(mtod(m, caddr_t) + off); eip6 = (struct ip6_hdr *)(icmp6 + 1); + bzero(&icmp6dst, sizeof(icmp6dst)); /* Detect the upper level protocol */ { @@ -920,7 +921,6 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp int eoff = off + sizeof(struct icmp6_hdr) + sizeof(struct ip6_hdr); struct ip6ctlparam ip6cp; - struct in6_addr *finaldst = NULL; int icmp6type = icmp6->icmp6_type; struct ip6_frag *fh; struct ip6_rthdr *rth; @@ -994,10 +994,11 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp } rth0 = (struct ip6_rthdr0 *) (mtod(m, caddr_t) + eoff); + /* just ignore a bogus header */ if ((rth0->ip6r0_len % 2) == 0 && (hops = rth0->ip6r0_len/2)) - finaldst = (struct in6_addr *)(rth0 + 1) + (hops - 1); + icmp6dst.sin6_addr = *((struct in6_addr *)(rth0 + 1) + (hops - 1)); } eoff += rthlen; nxt = rth->ip6r_nxt; @@ -1051,13 +1052,10 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp */ eip6 = (struct ip6_hdr *)(icmp6 + 1); - bzero(&icmp6dst, sizeof(icmp6dst)); icmp6dst.sin6_len = sizeof(struct sockaddr_in6); icmp6dst.sin6_family = AF_INET6; - if (finaldst == NULL) + if (IN6_IS_ADDR_UNSPECIFIED(&icmp6dst.sin6_addr)) icmp6dst.sin6_addr = eip6->ip6_dst; - else - icmp6dst.sin6_addr = *finaldst; if (in6_setscope(&icmp6dst.sin6_addr, m->m_pkthdr.rcvif, NULL)) goto freeit; bzero(&icmp6src, sizeof(icmp6src)); @@ -1069,13 +1067,11 @@ icmp6_notify_error(struct mbuf **mp, int off, int icmp icmp6src.sin6_flowinfo = (eip6->ip6_flow & IPV6_FLOWLABEL_MASK); - if (finaldst == NULL) - finaldst = &eip6->ip6_dst; ip6cp.ip6c_m = m; ip6cp.ip6c_icmp6 = icmp6; ip6cp.ip6c_ip6 = (struct ip6_hdr *)(icmp6 + 1); ip6cp.ip6c_off = eoff; - ip6cp.ip6c_finaldst = finaldst; + ip6cp.ip6c_finaldst = &icmp6dst.sin6_addr; ip6cp.ip6c_src = &icmp6src; ip6cp.ip6c_nxt = nxt;