From patchwork Fri Aug 11 14:05:31 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 800568 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 3xTRff2hMQz9t2h for ; Sat, 12 Aug 2017 00:07:54 +1000 (AEST) Received: from localhost ([::1]:43156 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dgAbQ-0001yZ-66 for incoming@patchwork.ozlabs.org; Fri, 11 Aug 2017 10:07:52 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56995) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dgAZe-00017u-Sc for qemu-devel@nongnu.org; Fri, 11 Aug 2017 10:06:07 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dgAZc-0002WO-JN for qemu-devel@nongnu.org; Fri, 11 Aug 2017 10:06:02 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48566) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dgAZW-0002MU-SL; Fri, 11 Aug 2017 10:05:54 -0400 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 mx1.redhat.com (Postfix) with ESMTPS id D15F4B17E; Fri, 11 Aug 2017 14:05:53 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com D15F4B17E Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx06.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=kwolf@redhat.com Received: from localhost.localdomain.com (ovpn-116-116.ams2.redhat.com [10.36.116.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2D8AB97DE5; Fri, 11 Aug 2017 14:05:52 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Date: Fri, 11 Aug 2017 16:05:31 +0200 Message-Id: <20170811140536.2792-3-kwolf@redhat.com> In-Reply-To: <20170811140536.2792-1-kwolf@redhat.com> References: <20170811140536.2792-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Fri, 11 Aug 2017 14:05:54 +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] [PULL 2/7] vpc: Check failure of bdrv_getlength() 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: kwolf@redhat.com, peter.maydell@linaro.org, qemu-devel@nongnu.org, stefanha@redhat.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Eric Blake vpc_open() was checking for bdrv_getlength() failure in one, but not the other, location. Reported-by: Markus Armbruster Signed-off-by: Eric Blake Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Jeff Cody Reviewed-by: John Snow Signed-off-by: Kevin Wolf --- block/vpc.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/block/vpc.c b/block/vpc.c index 574879ba7c..82911ebead 100644 --- a/block/vpc.c +++ b/block/vpc.c @@ -219,6 +219,7 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, uint64_t pagetable_size; int disk_type = VHD_DYNAMIC; int ret; + int64_t bs_size; bs->file = bdrv_open_child(NULL, options, "file", bs, &child_file, false, errp); @@ -411,7 +412,13 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags, } } - if (s->free_data_block_offset > bdrv_getlength(bs->file->bs)) { + bs_size = bdrv_getlength(bs->file->bs); + if (bs_size < 0) { + error_setg_errno(errp, -bs_size, "Unable to learn image size"); + ret = bs_size; + goto fail; + } + if (s->free_data_block_offset > bs_size) { error_setg(errp, "block-vpc: free_data_block_offset points after " "the end of file. The image has been truncated."); ret = -EINVAL;