From nobody Tue Nov 11 20:53:47 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; spf=pass (zoho.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=virtuozzo.com ARC-Seal: i=1; a=rsa-sha256; t=1565364854; cv=none; d=zoho.com; s=zohoarc; b=W3r3guFlTRwk10XXgUqmOnnwNPopqd2uwHmmVIr6xmOBd8nNIZNGRDxVAdcbHGwlNFa7ZdyZHLS8vP8OxrnHJOvbfPvbbbSSNzF6IUrH/4lkbse/fMBsqUHLnfLRAA+T2V0wMWrfmuPsUT12EY42cOe4vDbAGRbNMCUtu+2nAsg= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1565364854; h=Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:Message-ID:References:Sender:Subject:To:ARC-Authentication-Results; bh=905t/uiZ6C/Q0x2CpY1Bne+fC24Sjf1bwvvm1fd7QTI=; b=nq2mlkW7PZPIvkapLs0idORNcqD96Q9vIgQ/cryR+pA/wVTTaDwxQ5pnw+kGNsDVkDEQ7uKc8I7JqbocHYl2V/dr3Y+fk04RNyF8aDU+FjELCu71vUoSdhUAHEIgyghjDCQNUQjcAeIH/CAbxkUQLF+w/bOE1U5HU2yGuHIh9Nw= ARC-Authentication-Results: i=1; mx.zoho.com; spf=pass (zoho.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 header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1565364854531285.69751717021336; Fri, 9 Aug 2019 08:34:14 -0700 (PDT) Received: from localhost ([::1]:60150 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hw6uD-0005kL-Je for importer@patchew.org; Fri, 09 Aug 2019 11:34:13 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:49052) by lists.gnu.org with esmtp (Exim 4.86_2) (envelope-from ) id 1hw6sL-0003v2-IN for qemu-devel@nongnu.org; Fri, 09 Aug 2019 11:32:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hw6sK-0002oh-CT for qemu-devel@nongnu.org; Fri, 09 Aug 2019 11:32:17 -0400 Received: from relay.sw.ru ([185.231.240.75]:57606) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hw6sI-0002il-0r; Fri, 09 Aug 2019 11:32:14 -0400 Received: from [10.94.3.0] (helo=kvm.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92) (envelope-from ) id 1hw6sD-0004Cp-7J; Fri, 09 Aug 2019 18:32:09 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Date: Fri, 9 Aug 2019 18:32:05 +0300 Message-Id: <20190809153207.49288-6-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20190809153207.49288-1-vsementsov@virtuozzo.com> References: <20190809153207.49288-1-vsementsov@virtuozzo.com> X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v2 5/7] block/backup: fix backup_cow_with_offload for last cluster 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: fam@euphon.net, kwolf@redhat.com, vsementsov@virtuozzo.com, armbru@redhat.com, qemu-devel@nongnu.org, mreitz@redhat.com, stefanha@redhat.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" We shouldn't try to copy bytes beyond EOF. Fix it. Signed-off-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz --- block/backup.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/block/backup.c b/block/backup.c index 228ba9423c..d482d93458 100644 --- a/block/backup.c +++ b/block/backup.c @@ -155,7 +155,7 @@ static int coroutine_fn backup_cow_with_offload(BackupB= lockJob *job, int ret; int nr_clusters; BlockBackend *blk =3D job->common.blk; - int nbytes =3D end - start; + int nbytes =3D MIN(end - start, job->len - start); int read_flags =3D is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0; =20 assert(end - start < INT_MAX); --=20 2.18.0