From nobody Sun Apr 28 20:56:50 2024 Delivered-To: importer@patchew.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 ARC-Seal: i=1; a=rsa-sha256; t=1604591591; cv=none; d=zohomail.com; s=zohoarc; b=dSFB0R5wFib+dAvPq3lqU1W8JLh8HadUEiRAIlAc8Eu9XoP2gNl0/gWHlPKoYdzlLOatK63NQJHD/YU0GerpbdEckizQEgvC8kLzdssVinT7droeJMIFjGuxTYAICF6ksSaF4dz0vETPkvGSPL7syDaZvdqCde8a1beA+8+MNdo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1604591591; h=Content-Type:Content-Transfer-Encoding:Cc:Date:From:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:Sender:Subject:To; bh=9wx9PY+GRkImCX9zjnpszUPN/ErsdlC5rR7ZwlPk4fI=; b=d7KmRhBebVUAwMKtqfMsBNLkls82HCitGX0Bnv0/VJiwI0zg3msGiHJ1VGp6dF0byoDXw8wdPIicYcjKup7WsGjm0SVjTiz9ceVQR75D+2g9hXzwHbDshvlKtklecH8zoQu00iLDb0HJkvttGWCKJ3AKCjiJ6xvomGuy+IO6DA0= ARC-Authentication-Results: i=1; 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 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 1604591591194560.1453102666829; Thu, 5 Nov 2020 07:53:11 -0800 (PST) Received: from localhost ([::1]:49324 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kahZV-00017c-VH for importer@patchew.org; Thu, 05 Nov 2020 10:53:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34994) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kahXx-0008M2-Jz for qemu-devel@nongnu.org; Thu, 05 Nov 2020 10:51:33 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:38885) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kahXw-0008Ht-2E for qemu-devel@nongnu.org; Thu, 05 Nov 2020 10:51:33 -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-271-43b9Id0tP5uwdp3vwg8_0Q-1; Thu, 05 Nov 2020 10:51:29 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id ABA0242380; Thu, 5 Nov 2020 15:51:27 +0000 (UTC) Received: from blue.redhat.com (ovpn-114-103.phx2.redhat.com [10.3.114.103]) by smtp.corp.redhat.com (Postfix) with ESMTP id CAE811002382; Thu, 5 Nov 2020 15:51:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1604591491; 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; bh=9wx9PY+GRkImCX9zjnpszUPN/ErsdlC5rR7ZwlPk4fI=; b=h4gesbGCpPEObN2eRzgPirDJh8UdV6quu1VpMZhoS5B6hFy3iSvaqmM9O5n7+0kLw2in+m W+HpE927MWLmwxc3i1laan5IYovOJ6Q4OYgWkzeMpSRw4u/JMTWMMz++Wew1Vzfp/gBml6 nOXa+Be2DN4+V6mS1zLe40YiNPt8CrI= X-MC-Unique: 43b9Id0tP5uwdp3vwg8_0Q-1 From: Eric Blake To: qemu-devel@nongnu.org Subject: [PATCH v4] block: Fix integer promotion error in bdrv_getlength() Date: Thu, 5 Nov 2020 09:51:22 -0600 Message-Id: <20201105155122.60943-1-eblake@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eblake@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable 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; Received-SPF: pass client-ip=216.205.24.124; envelope-from=eblake@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/11/05 01:14:53 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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, chengchiwen@h3c.com, berto@igalia.com, tu.guoyi@h3c.com, "open list:Block layer core" , armbru@redhat.com, mreitz@redhat.com, wang.yongD@h3c.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" Back in 2015, we attempted to fix error reporting for images that claimed to have more than INT64_MAX/512 sectors, but due to the type promotions caused by BDRV_SECTOR_SIZE being unsigned, this inadvertently forces all negative ret values to be slammed into -EFBIG rather than the original error. While we're at it, we can avoid the confusing ?: by spelling the logic more directly. Fixes: 4a9c9ea0d3 Reported-by: Guoyi Tu Signed-off-by: Eric Blake Reviewed-by: Alberto Garcia --- block.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/block.c b/block.c index 56bacc9e9f13..2fd932154e12 100644 --- a/block.c +++ b/block.c @@ -5091,8 +5091,13 @@ int64_t bdrv_getlength(BlockDriverState *bs) { int64_t ret =3D bdrv_nb_sectors(bs); - ret =3D ret > INT64_MAX / BDRV_SECTOR_SIZE ? -EFBIG : ret; - return ret < 0 ? ret : ret * BDRV_SECTOR_SIZE; + if (ret < 0) { + return ret; + } + if (ret > INT64_MAX / BDRV_SECTOR_SIZE) { + return -EFBIG; + } + return ret * BDRV_SECTOR_SIZE; } /* return 0 as number of sectors if no device present or error */ --=20 2.28.0