From nobody Fri Dec 19 18:41:35 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=pass; 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=pass(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 158203495485327.25739880890535; Tue, 18 Feb 2020 06:09:14 -0800 (PST) Received: from localhost ([::1]:35722 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j43Yn-0000T3-Rv for importer@patchew.org; Tue, 18 Feb 2020 09:09:13 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52806) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j43Xh-0006rZ-Um for qemu-devel@nongnu.org; Tue, 18 Feb 2020 09:08:06 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j43Xg-0001QS-UM for qemu-devel@nongnu.org; Tue, 18 Feb 2020 09:08:05 -0500 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:40485 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 1j43Xg-0001Pz-Qg for qemu-devel@nongnu.org; Tue, 18 Feb 2020 09:08:04 -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-285-MT_4gvgvPxWqSg7llYwO9A-1; Tue, 18 Feb 2020 09:08:01 -0500 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id E397D18FE879; Tue, 18 Feb 2020 14:07:59 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-117-181.ams2.redhat.com [10.36.117.181]) by smtp.corp.redhat.com (Postfix) with ESMTP id DDBEB19E9C; Tue, 18 Feb 2020 14:07:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1582034883; 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=OaAAOgUxvfCKha/fWoEmi4fIag5om0BwBxSd24Q7muk=; b=LXEgE9PC+91tI5ZksJt2cleQQsUPGma6Lpqf9xRheZvkoZfNjSQrO8eQcJiP/Xo8DhMgAZ hxnTT+p12KPlAhMlszyzVSvsphd8pP22oIdZ9XBFbLGKVT+osjwyPyMYbq6KfTjuhlCbjg uraJSZJ9p8F3qTsYTfcUkMuRzXsvuwk= From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 06/36] qcow2: Fix qcow2_alloc_cluster_abort() for external data file Date: Tue, 18 Feb 2020 15:06:52 +0100 Message-Id: <20200218140722.23876-7-kwolf@redhat.com> In-Reply-To: <20200218140722.23876-1-kwolf@redhat.com> References: <20200218140722.23876-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-MC-Unique: MT_4gvgvPxWqSg7llYwO9A-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, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @redhat.com) 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 Message-Id: <20200211094900.17315-3-kwolf@redhat.com> 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 1947f13a2d..78c95dfa16 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1026,8 +1026,11 @@ 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