From owner-svn-src-stable@freebsd.org Fri Jan 6 03:55:29 2017 Return-Path: Delivered-To: svn-src-stable@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id A279ECA08C1; Fri, 6 Jan 2017 03:55:29 +0000 (UTC) (envelope-from ngie@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 mx1.freebsd.org (Postfix) with ESMTPS id 71C2B16CE; Fri, 6 Jan 2017 03:55:29 +0000 (UTC) (envelope-from ngie@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id v063tSx1057522; Fri, 6 Jan 2017 03:55:28 GMT (envelope-from ngie@FreeBSD.org) Received: (from ngie@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id v063tSOB057521; Fri, 6 Jan 2017 03:55:28 GMT (envelope-from ngie@FreeBSD.org) Message-Id: <201701060355.v063tSOB057521@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: ngie set sender to ngie@FreeBSD.org using -f From: Ngie Cooper Date: Fri, 6 Jan 2017 03:55:28 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r311468 - stable/10/contrib/bsnmp/snmp_mibII X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for all the -stable branches of the src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 06 Jan 2017 03:55:29 -0000 Author: ngie Date: Fri Jan 6 03:55:28 2017 New Revision: 311468 URL: https://svnweb.freebsd.org/changeset/base/311468 Log: MFstable/11 r311467: MFC r310873: Guard against use-after-free after calling mibif_free(..) Set variables to NULL after calling free. Also, remove unnecessary if (x != NULL) checks before calling free(x) Modified: stable/10/contrib/bsnmp/snmp_mibII/mibII.c Directory Properties: stable/10/ (props changed) Modified: stable/10/contrib/bsnmp/snmp_mibII/mibII.c ============================================================================== --- stable/10/contrib/bsnmp/snmp_mibII/mibII.c Fri Jan 6 03:54:26 2017 (r311467) +++ stable/10/contrib/bsnmp/snmp_mibII/mibII.c Fri Jan 6 03:55:28 2017 (r311468) @@ -707,10 +707,11 @@ mibif_free(struct mibif *ifp) } free(ifp->private); - if (ifp->physaddr != NULL) - free(ifp->physaddr); - if (ifp->specmib != NULL) - free(ifp->specmib); + ifp->private = NULL; + free(ifp->physaddr); + ifp->physaddr = NULL; + free(ifp->specmib); + ifp->specmib = NULL; STAILQ_FOREACH(map, &mibindexmap_list, link) if (map->mibif == ifp) { @@ -745,8 +746,8 @@ mibif_free(struct mibif *ifp) at = at1; } - free(ifp); + ifp = NULL; mib_if_number--; mib_iftable_last_change = this_tick; }