From nobody Sun Feb 8 18:29:42 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) client-ip=208.118.235.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zoho.com; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; Return-Path: Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) by mx.zohomail.com with SMTPS id 1493135032114309.9999153242467; Tue, 25 Apr 2017 08:43:52 -0700 (PDT) Received: from localhost ([::1]:49997 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d32d4-0003UI-Nw for importer@patchew.org; Tue, 25 Apr 2017 11:43:50 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52151) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1d32Yq-00081M-8S for qemu-devel@nongnu.org; Tue, 25 Apr 2017 11:39:29 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1d32Yp-00081y-FR for qemu-devel@nongnu.org; Tue, 25 Apr 2017 11:39:28 -0400 Received: from mx1.redhat.com ([209.132.183.28]:57060) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1d32Yi-0007wm-KJ; Tue, 25 Apr 2017 11:39:20 -0400 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 7A0CF81240; Tue, 25 Apr 2017 15:39:19 +0000 (UTC) Received: from dhcp-17-113.lcy.redhat.com (unknown [10.42.17.113]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0D3FA84E1D; Tue, 25 Apr 2017 15:39:14 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 7A0CF81240 Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx01.extmail.prod.ext.phx2.redhat.com; spf=pass smtp.mailfrom=berrange@redhat.com DKIM-Filter: OpenDKIM Filter v2.11.0 mx1.redhat.com 7A0CF81240 From: "Daniel P. Berrange" To: qemu-devel@nongnu.org Date: Tue, 25 Apr 2017 16:38:44 +0100 Message-Id: <20170425153858.25660-5-berrange@redhat.com> In-Reply-To: <20170425153858.25660-1-berrange@redhat.com> References: <20170425153858.25660-1-berrange@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 25 Apr 2017 15:39:19 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PATCH v6 04/18] qcow: require image size to be > 1 for new images 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: Kevin Wolf , Alberto Garcia , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail: RSF_0 Z_629925259 SPT_0 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The qcow driver refuses to open images which are less than 2 bytes in size, but will happily create such images. Add a check in the create path to avoid this discrepancy. Reviewed-by: Max Reitz Reviewed-by: Alberto Garcia Reviewed-by: Eric Blake Signed-off-by: Daniel P. Berrange --- block/qcow.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/block/qcow.c b/block/qcow.c index 9d6ac83..d6ce46c 100644 --- a/block/qcow.c +++ b/block/qcow.c @@ -811,6 +811,12 @@ static int qcow_create(const char *filename, QemuOpts = *opts, Error **errp) /* Read out options */ total_size =3D ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0), BDRV_SECTOR_SIZE); + if (total_size =3D=3D 0) { + error_setg(errp, "Image size is too small, cannot be zero length"); + ret =3D -EINVAL; + goto cleanup; + } + backing_file =3D qemu_opt_get_del(opts, BLOCK_OPT_BACKING_FILE); if (qemu_opt_get_bool_del(opts, BLOCK_OPT_ENCRYPT, false)) { flags |=3D BLOCK_FLAG_ENCRYPT; --=20 2.9.3