From nobody Thu Nov 13 16:13:59 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=redhat.com Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1581414630835518.8240865273308; Tue, 11 Feb 2020 01:50:30 -0800 (PST) Received: from localhost ([::1]:46702 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1SBY-00061v-WD for importer@patchew.org; Tue, 11 Feb 2020 04:50:29 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:46572) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j1SAO-0004X9-J0 for qemu-devel@nongnu.org; Tue, 11 Feb 2020 04:49:17 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j1SAN-0000jp-K9 for qemu-devel@nongnu.org; Tue, 11 Feb 2020 04:49:16 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:52237 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1j1SAN-0000jX-GI for qemu-devel@nongnu.org; Tue, 11 Feb 2020 04:49:15 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-349-WOgzxcC4OeeE-Gp2PwTuJg-1; Tue, 11 Feb 2020 04:49:13 -0500 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 737948017DF; Tue, 11 Feb 2020 09:49:12 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-117-79.ams2.redhat.com [10.36.117.79]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1B84B165D3; Tue, 11 Feb 2020 09:49:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1581414555; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Opj16yp/AbBRXEGUZp9SBYI352Hxez9tbxd8ID6dy0o=; b=UtbZ643l5KObxvBfq7S0lu5dbsCmSc+xk6ZtevoNFgrk7Vd+SbbzNVQwldmo6Y/Vjl44sn 96fUQpVy/JbjKgApg7ttkJ01L1i7nbnvMk/F189w9mUf2croVXTVy4Ag8vzPo8wbeN6po3 0jmqVUgz4J8bNQW0kAkGPWQ4Vhlkt94= From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH 2/3] qcow2: Fix qcow2_alloc_cluster_abort() for external data file Date: Tue, 11 Feb 2020 10:48:59 +0100 Message-Id: <20200211094900.17315-3-kwolf@redhat.com> In-Reply-To: <20200211094900.17315-1-kwolf@redhat.com> References: <20200211094900.17315-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-MC-Unique: WOgzxcC4OeeE-Gp2PwTuJg-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, pbutsykin@virtuozzo.com, jsnow@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" For external data file, cluster allocations return an offset in the data file and are not refcounted. In this case, there is nothing to do for qcow2_alloc_cluster_abort(). Freeing the same offset in the qcow2 file is wrong and causes crashes in the better case or image corruption in the worse case. Signed-off-by: Kevin Wolf --- block/qcow2-cluster.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 8982b7b762..dc3c270226 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1015,8 +1015,11 @@ err: void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m) { BDRVQcow2State *s =3D bs->opaque; - qcow2_free_clusters(bs, m->alloc_offset, m->nb_clusters << s->cluster_= bits, - QCOW2_DISCARD_NEVER); + if (!has_data_file(bs)) { + qcow2_free_clusters(bs, m->alloc_offset, + m->nb_clusters << s->cluster_bits, + QCOW2_DISCARD_NEVER); + } } =20 /* --=20 2.20.1