From patchwork Tue Aug 9 08:50:09 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: 9270635 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 269E66082E for ; Tue, 9 Aug 2016 08:50:38 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 13E9B1FFCA for ; Tue, 9 Aug 2016 08:50:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 04099281A7; Tue, 9 Aug 2016 08:50:38 +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 88FC01FFCA for ; 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Tue, 9 Aug 2016 08:50:15 +0000 (UTC) Received: from pkalever.blr.redhat.com (pkalever.blr.redhat.com [10.70.1.86]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u798oCMS019770; Tue, 9 Aug 2016 04:50:12 -0400 From: Prasanna Kumar Kalever To: qemu-devel@nongnu.org Date: Tue, 9 Aug 2016 14:20:09 +0530 Message-Id: <1470732609-15488-1-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 [10.5.110.27]); Tue, 09 Aug 2016 08:50:15 +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 v2 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 Note: As now the port string to int conversion has its defence code set, and also we understand that port argument is actually a string type, in the follow up patch let's move port type from QEMU_OPT_NUMBER to QEMU_OPT_STRING Signed-off-by: Prasanna Kumar Kalever Reviewed-by: Markus Armbruster --- v1: Initial patch v2: Address comments on v1 given by Markus --- block/gluster.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/block/gluster.c b/block/gluster.c index 01b479f..edde1ad 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; + unsigned long long port; glfs = glfs_new(gconf->volume); if (!glfs) { @@ -330,10 +332,17 @@ 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, 10) < 0) || + (port > 65535)) { + error_setg(errp, "'%s' is not a valid port number", + 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) {