From owner-svn-src-head@freebsd.org Sat Dec 31 22:46:18 2016 Return-Path: Delivered-To: svn-src-head@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 62D40C9912D; Sat, 31 Dec 2016 22:46:18 +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 3D588149A; Sat, 31 Dec 2016 22:46:18 +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 uBVMkH7a037026; Sat, 31 Dec 2016 22:46:17 GMT (envelope-from ngie@FreeBSD.org) Received: (from ngie@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id uBVMkHff037025; Sat, 31 Dec 2016 22:46:17 GMT (envelope-from ngie@FreeBSD.org) Message-Id: <201612312246.uBVMkHff037025@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: ngie set sender to ngie@FreeBSD.org using -f From: Ngie Cooper Date: Sat, 31 Dec 2016 22:46:17 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r310987 - head/usr.sbin/bsnmpd/tools/libbsnmptools X-SVN-Group: head MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 31 Dec 2016 22:46:18 -0000 Author: ngie Date: Sat Dec 31 22:46:17 2016 New Revision: 310987 URL: https://svnweb.freebsd.org/changeset/base/310987 Log: snmp_output_err_resp, snmp_output_resp: allocate `object` using calloc, not on the stack Some of the callers try to determine whether or not `object` is valid by testing the value for NULL, which will never be true if it's a stack value, so in order to be clear and correct down the call stack, use a heap allocated object. This also addresses a Coverity issue by initializing all of `object` via calloc MFC after: 1 week Reported by: Coverity CID: 1006392 Modified: head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c Modified: head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c ============================================================================== --- head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c Sat Dec 31 22:18:33 2016 (r310986) +++ head/usr.sbin/bsnmpd/tools/libbsnmptools/bsnmptools.c Sat Dec 31 22:46:17 2016 (r310987) @@ -2003,20 +2003,25 @@ snmp_output_object(struct snmp_toolinfo void snmp_output_err_resp(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu) { + struct snmp_object *object; char buf[ASN_OIDSTRLEN]; - struct snmp_object object; if (pdu == NULL || (pdu->error_index > (int32_t) pdu->nbindings)) { - fprintf(stdout,"Invalid error index in PDU\n"); + fprintf(stdout, "Invalid error index in PDU\n"); + return; + } + + if ((object = calloc(1, sizeof(struct snmp_object))) != NULL) { + fprintf(stdout, "calloc: %s", strerror(errno)); return; } fprintf(stdout, "Agent %s:%s returned error \n", snmp_client.chost, snmp_client.cport); - if (!ISSET_NUMERIC(snmptoolctx) && (snmp_fill_object(snmptoolctx, &object, + if (!ISSET_NUMERIC(snmptoolctx) && (snmp_fill_object(snmptoolctx, object, &(pdu->bindings[pdu->error_index - 1])) > 0)) - snmp_output_object(snmptoolctx, &object); + snmp_output_object(snmptoolctx, object); else { asn_oid2str_r(&(pdu->bindings[pdu->error_index - 1].var), buf); fprintf(stdout,"%s", buf); @@ -2028,17 +2033,23 @@ snmp_output_err_resp(struct snmp_toolinf fprintf(stdout, "%s\n", error_strings[pdu->error_status].str); else fprintf(stdout,"%s\n", error_strings[SNMP_ERR_UNKNOWN].str); + + free(object); + object = NULL; } int32_t snmp_output_resp(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu, struct asn_oid *root) { - struct snmp_object object; + struct snmp_object *object; char p[ASN_OIDSTRLEN]; int32_t error; uint32_t i; + if ((object = calloc(1, sizeof(struct snmp_object))) == NULL) + return (-1); + i = error = 0; while (i < pdu->nbindings) { if (root != NULL && !(asn_is_suboid(root, @@ -2047,18 +2058,22 @@ snmp_output_resp(struct snmp_toolinfo *s if (GET_OUTPUT(snmptoolctx) != OUTPUT_QUIET) { if (!ISSET_NUMERIC(snmptoolctx) && - (snmp_fill_object(snmptoolctx, &object, + (snmp_fill_object(snmptoolctx, object, &(pdu->bindings[i])) > 0)) - snmp_output_object(snmptoolctx, &object); + snmp_output_object(snmptoolctx, object); else { asn_oid2str_r(&(pdu->bindings[i].var), p); fprintf(stdout, "%s", p); } } - error |= snmp_output_numval(snmptoolctx, &(pdu->bindings[i]), object.info); + error |= snmp_output_numval(snmptoolctx, &(pdu->bindings[i]), + object->info); i++; } + free(object); + object = NULL; + if (error) return (-1);