From patchwork Wed Aug 3 17:16:20 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Prasanna Kumar Kalever X-Patchwork-Id: 9261655 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 9C44960754 for ; Wed, 3 Aug 2016 17:17:05 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 88F0B28174 for ; Wed, 3 Aug 2016 17:17:05 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7D03828210; Wed, 3 Aug 2016 17:17:05 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 1C2C628174 for ; 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Wed, 3 Aug 2016 17:16:42 +0000 (UTC) Received: from localhost.localdomain.com (vpn1-4-200.sin2.redhat.com [10.67.4.200]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u73HGXaO012582; Wed, 3 Aug 2016 13:16:36 -0400 From: Prasanna Kumar Kalever To: qemu-devel@nongnu.org Date: Wed, 3 Aug 2016 13:16:20 -0400 Message-Id: <1470244580-4741-1-git-send-email-prasanna.kalever@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.39]); Wed, 03 Aug 2016 17:16:43 +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 v1 1/1] block/gluster: improve defense over string to int conversion 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: Prasanna Kumar Kalever , vbellur@redhat.com, jcody@redhat.com, armbru@redhat.com, areis@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP using atoi() for converting string to int may be error prone in case if string supplied in the argument is not a fold of numerical number, This is not a bug because in the existing code, static QemuOptsList runtime_tcp_opts = { .name = "gluster_tcp", .head = QTAILQ_HEAD_INITIALIZER(runtime_tcp_opts.head), .desc = { ... { .name = GLUSTER_OPT_PORT, .type = QEMU_OPT_NUMBER, .help = "port number ...", }, ... }; port type is QEMU_OPT_NUMBER, before we actually reaches atoi() port is already defended by parse_option_number() However It is a good practice to use function like parse_uint_full() over atoi() to keep port self defended Signed-off-by: Prasanna Kumar Kalever --- block/gluster.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/block/gluster.c b/block/gluster.c index 01b479f..e2aa0f3 100644 --- a/block/gluster.c +++ b/block/gluster.c @@ -14,6 +14,7 @@ #include "qapi/qmp/qerror.h" #include "qemu/uri.h" #include "qemu/error-report.h" +#include "qemu/cutils.h" #define GLUSTER_OPT_FILENAME "filename" #define GLUSTER_OPT_VOLUME "volume" @@ -318,6 +319,7 @@ static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, int ret; int old_errno; GlusterServerList *server; + long long unsigned port; glfs = glfs_new(gconf->volume); if (!glfs) { @@ -330,10 +332,16 @@ static struct glfs *qemu_gluster_glfs_init(BlockdevOptionsGluster *gconf, GlusterTransport_lookup[server->value->type], server->value->u.q_unix.path, 0); } else { + if (parse_uint_full(server->value->u.tcp.port, &port, 0) < 0) { + error_setg(errp, "can't convert port to a number: %s", + server->value->u.tcp.port); + errno = EINVAL; + goto out; + } ret = glfs_set_volfile_server(glfs, GlusterTransport_lookup[server->value->type], server->value->u.tcp.host, - atoi(server->value->u.tcp.port)); + (int)port); } if (ret < 0) {