From owner-svn-src-stable-12@freebsd.org Mon Mar 2 13:23:29 2020 Return-Path: Delivered-To: svn-src-stable-12@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 B39691AEA52; Mon, 2 Mar 2020 13:23:29 +0000 (UTC) (envelope-from bz@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) server-signature RSA-PSS (4096 bits) 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 48WLSK3Q6Fz3PjM; Mon, 2 Mar 2020 13:23:29 +0000 (UTC) (envelope-from bz@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 4D0091D01A; Mon, 2 Mar 2020 13:23:29 +0000 (UTC) (envelope-from bz@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 022DNTBO011366; Mon, 2 Mar 2020 13:23:29 GMT (envelope-from bz@FreeBSD.org) Received: (from bz@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 022DNT7j011365; Mon, 2 Mar 2020 13:23:29 GMT (envelope-from bz@FreeBSD.org) Message-Id: <202003021323.022DNT7j011365@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: bz set sender to bz@FreeBSD.org using -f From: "Bjoern A. Zeeb" Date: Mon, 2 Mar 2020 13:23:29 +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: r358542 - stable/12/sys/netinet6 X-SVN-Group: stable-12 X-SVN-Commit-Author: bz X-SVN-Commit-Paths: stable/12/sys/netinet6 X-SVN-Commit-Revision: 358542 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 02 Mar 2020 13:23:29 -0000 Author: bz Date: Mon Mar 2 13:23:28 2020 New Revision: 358542 URL: https://svnweb.freebsd.org/changeset/base/358542 Log: MFC r358427: initialize oifp to avoid bogus results/panics in edge cases In certain cases (probably not during normal operation but observed in the lab during development) ip6_ouput() could return without error and ifpp (&oifp) not updated. Given oifp was never initialized we would take the later branch as oifp was not NULL, and when calling icmp6_ifstat_inc() we would panic dereferencing a garbage pointer. For code stability initialize oifp to NULL before first use to always have a deterministic value and not rely on a called function to behave and always and for ever do the work for us as we hope for. Sponsored by: Netflix Modified: stable/12/sys/netinet6/mld6.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/netinet6/mld6.c ============================================================================== --- stable/12/sys/netinet6/mld6.c Mon Mar 2 13:16:40 2020 (r358541) +++ stable/12/sys/netinet6/mld6.c Mon Mar 2 13:23:28 2020 (r358542) @@ -3155,6 +3155,7 @@ mld_dispatch_packet(struct mbuf *m) mld = (struct mld_hdr *)(mtod(md, uint8_t *) + off); type = mld->mld_type; + oifp = NULL; error = ip6_output(m0, &mld_po, NULL, IPV6_UNSPECSRC, &im6o, &oifp, NULL); if (error) {