From patchwork Fri May 3 17:06:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefano Garzarella X-Patchwork-Id: 1094975 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=redhat.com Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 44wdpp4vn9z9s6w for ; Sat, 4 May 2019 03:07:14 +1000 (AEST) Received: from localhost ([127.0.0.1]:44777 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hMbeS-0000UL-Mi for incoming@patchwork.ozlabs.org; Fri, 03 May 2019 13:07:12 -0400 Received: from eggs.gnu.org ([209.51.188.92]:60266) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hMbdt-0000UG-BW for qemu-devel@nongnu.org; Fri, 03 May 2019 13:06:38 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hMbds-0000ww-AD for qemu-devel@nongnu.org; Fri, 03 May 2019 13:06:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:59786) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hMbds-0000vt-54 for qemu-devel@nongnu.org; Fri, 03 May 2019 13:06:36 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E302F3091749; Fri, 3 May 2019 17:06:34 +0000 (UTC) Received: from steredhat.redhat.com (unknown [10.36.118.31]) by smtp.corp.redhat.com (Postfix) with ESMTP id E21F419C4F; Fri, 3 May 2019 17:06:32 +0000 (UTC) From: Stefano Garzarella To: qemu-devel@nongnu.org Date: Fri, 3 May 2019 19:06:31 +0200 Message-Id: <20190503170631.228487-1-sgarzare@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.41]); Fri, 03 May 2019 17:06:34 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH] net: avoid to use variable length array in net_client_init() X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Jason Wang Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" net_client_init() uses a variable length array to store the prefix of 'ipv6-net' parameter (e.g. if ipv6-net=fec0::0/64, the prefix is 'fec0::0'). Since the IPv6 prefix can be at most as long as an IPv6 address, we can use an array with fixed size equals to INET6_ADDRSTRLEN. Signed-off-by: Stefano Garzarella --- net/net.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/net.c b/net/net.c index f3a3c5444c..2e5f27e121 100644 --- a/net/net.c +++ b/net/net.c @@ -1118,7 +1118,7 @@ static int net_client_init(QemuOpts *opts, bool is_netdev, Error **errp) const char *ip6_net = qemu_opt_get(opts, "ipv6-net"); if (ip6_net) { - char buf[strlen(ip6_net) + 1]; + char buf[INET6_ADDRSTRLEN]; if (get_str_sep(buf, sizeof(buf), &ip6_net, '/') < 0) { /* Default 64bit prefix length. */