From patchwork Mon Aug 7 03:08:19 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Cody X-Patchwork-Id: 798469 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 3xQjGV6ryLz9sCZ for ; Mon, 7 Aug 2017 13:10:58 +1000 (AEST) Received: from localhost ([::1]:35150 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1deYRU-0005IG-Sm for incoming@patchwork.ozlabs.org; Sun, 06 Aug 2017 23:10:56 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58953) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1deYP9-0003hK-Ok for qemu-devel@nongnu.org; Sun, 06 Aug 2017 23:08:34 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1deYP8-0005qF-Em for qemu-devel@nongnu.org; Sun, 06 Aug 2017 23:08:31 -0400 Received: from mx1.redhat.com ([209.132.183.28]:40698) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1deYP3-0005ny-UR; Sun, 06 Aug 2017 23:08:26 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 1628778EA2; Mon, 7 Aug 2017 03:08:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 1628778EA2 Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx03.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=jcody@redhat.com Received: from localhost (ovpn-116-54.phx2.redhat.com [10.3.116.54]) by smtp.corp.redhat.com (Postfix) with ESMTPS id C551A77EFD; Mon, 7 Aug 2017 03:08:22 +0000 (UTC) From: Jeff Cody To: qemu-devel@nongnu.org Date: Sun, 6 Aug 2017 23:08:19 -0400 Message-Id: <85fe374c783a6d659bc86aa7f15d5f442b9d7a45.1502075213.git.jcody@redhat.com> In-Reply-To: References: In-Reply-To: References: X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Mon, 07 Aug 2017 03:08:23 +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] [PATCH 1/2] block/vhdx: check error return 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: armbru@redhat.com, qemu-block@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Calls to bdrv_getlength() were not checking for error. In vhdx.c, this can lead to truncating an image file, so it is a definite bug. In vhdx-log.c, the path for improper behavior is less clear, but it is best to check in any case. Reported-by: Markus Armbruster Signed-off-by: Jeff Cody Reviewed-by: Eric Blake --- block/vhdx-log.c | 20 ++++++++++++++++---- block/vhdx.c | 9 ++++++++- 2 files changed, 24 insertions(+), 5 deletions(-) diff --git a/block/vhdx-log.c b/block/vhdx-log.c index 01278f3..fd4e7af 100644 --- a/block/vhdx-log.c +++ b/block/vhdx-log.c @@ -491,6 +491,7 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s, uint32_t cnt, sectors_read; uint64_t new_file_size; void *data = NULL; + int64_t file_length; VHDXLogDescEntries *desc_entries = NULL; VHDXLogEntryHeader hdr_tmp = { 0 }; @@ -510,10 +511,15 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s, if (ret < 0) { goto exit; } + file_length = bdrv_getlength(bs->file->bs); + if (file_length < 0) { + ret = file_length; + goto exit; + } /* if the log shows a FlushedFileOffset larger than our current file * size, then that means the file has been truncated / corrupted, and * we must refused to open it / use it */ - if (hdr_tmp.flushed_file_offset > bdrv_getlength(bs->file->bs)) { + if (hdr_tmp.flushed_file_offset > file_length) { ret = -EINVAL; goto exit; } @@ -543,7 +549,7 @@ static int vhdx_log_flush(BlockDriverState *bs, BDRVVHDXState *s, goto exit; } } - if (bdrv_getlength(bs->file->bs) < desc_entries->hdr.last_file_offset) { + if (file_length < desc_entries->hdr.last_file_offset) { new_file_size = desc_entries->hdr.last_file_offset; if (new_file_size % (1024*1024)) { /* round up to nearest 1MB boundary */ @@ -851,6 +857,7 @@ static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s, uint32_t partial_sectors = 0; uint32_t bytes_written = 0; uint64_t file_offset; + int64_t file_length; VHDXHeader *header; VHDXLogEntryHeader new_hdr; VHDXLogDescriptor *new_desc = NULL; @@ -913,10 +920,15 @@ static int vhdx_log_write(BlockDriverState *bs, BDRVVHDXState *s, .sequence_number = s->log.sequence, .descriptor_count = sectors, .reserved = 0, - .flushed_file_offset = bdrv_getlength(bs->file->bs), - .last_file_offset = bdrv_getlength(bs->file->bs), }; + file_length = bdrv_getlength(bs->file->bs); + if (file_length < 0) { + ret = file_length; + goto exit; + } + new_hdr.flushed_file_offset = file_length; + new_hdr.last_file_offset = file_length; new_hdr.log_guid = header->log_guid; desc_sectors = vhdx_compute_desc_sectors(new_hdr.descriptor_count); diff --git a/block/vhdx.c b/block/vhdx.c index a9cecd2..6a14999 100644 --- a/block/vhdx.c +++ b/block/vhdx.c @@ -1166,7 +1166,14 @@ exit: static int vhdx_allocate_block(BlockDriverState *bs, BDRVVHDXState *s, uint64_t *new_offset) { - *new_offset = bdrv_getlength(bs->file->bs); + int64_t current_len; + current_len = bdrv_getlength(bs->file->bs); + + if (current_len < 0) { + return current_len; + } + + *new_offset = current_len; /* per the spec, the address for a block is in units of 1MB */ *new_offset = ROUND_UP(*new_offset, 1024 * 1024);