From patchwork Fri Jul 8 17:21:36 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 9221601 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1F2C360467 for ; Fri, 8 Jul 2016 17:53:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 12A9D28111 for ; Fri, 8 Jul 2016 17:53:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 0757728156; Fri, 8 Jul 2016 17:53:39 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 6703728111 for ; Fri, 8 Jul 2016 17:53:38 +0000 (UTC) Received: from localhost ([::1]:47100 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLZy5-000497-Aw for patchwork-qemu-devel@patchwork.kernel.org; Fri, 08 Jul 2016 13:53:37 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:39001) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLZTq-0001SD-PB for qemu-devel@nongnu.org; Fri, 08 Jul 2016 13:22:23 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bLZTo-0008TK-SH for qemu-devel@nongnu.org; Fri, 08 Jul 2016 13:22:21 -0400 Received: from mx1.redhat.com ([209.132.183.28]:34724) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bLZTk-0008Rn-Va; Fri, 08 Jul 2016 13:22:17 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9F2973B75E; Fri, 8 Jul 2016 17:22:16 +0000 (UTC) Received: from noname.redhat.com (ovpn-116-56.ams2.redhat.com [10.36.116.56]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u68HLk3C006858; Fri, 8 Jul 2016 13:22:15 -0400 From: Kevin Wolf To: qemu-block@nongnu.org Date: Fri, 8 Jul 2016 19:21:36 +0200 Message-Id: <1467998504-15744-25-git-send-email-kwolf@redhat.com> In-Reply-To: <1467998504-15744-1-git-send-email-kwolf@redhat.com> References: <1467998504-15744-1-git-send-email-kwolf@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Fri, 08 Jul 2016 17:22:16 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: [Qemu-devel] [PULL 24/32] qcow2: Avoid making the L1 table too big 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, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Max Reitz We refuse to open images whose L1 table we deem "too big". Consequently, we should not produce such images ourselves. Cc: qemu-stable@nongnu.org Signed-off-by: Max Reitz Message-id: 20160615153630.2116-3-mreitz@redhat.com Reviewed-by: Eric Blake [mreitz: Added QEMU_BUILD_BUG_ON()] Signed-off-by: Max Reitz --- block/qcow2-cluster.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 6b92ce9..00c16dc 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -65,7 +65,8 @@ int qcow2_grow_l1_table(BlockDriverState *bs, uint64_t min_size, } } - if (new_l1_size > INT_MAX / sizeof(uint64_t)) { + QEMU_BUILD_BUG_ON(QCOW_MAX_L1_SIZE > INT_MAX); + if (new_l1_size > QCOW_MAX_L1_SIZE / sizeof(uint64_t)) { return -EFBIG; }