From patchwork Mon Sep 7 11:08:33 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kevin Wolf X-Patchwork-Id: 1358802 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Authentication-Results: ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=V4p4PyoI; dkim-atps=neutral Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4BlQZ81pDhz9sPB for ; Mon, 7 Sep 2020 21:10:55 +1000 (AEST) Received: from localhost ([::1]:57348 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kFF2y-0002Lx-3C for incoming@patchwork.ozlabs.org; Mon, 07 Sep 2020 07:10:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:58564) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kFF21-0001o9-6k for qemu-devel@nongnu.org; Mon, 07 Sep 2020 07:09:53 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:36837 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kFF1x-0007r5-9U for qemu-devel@nongnu.org; Mon, 07 Sep 2020 07:09:52 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1599476988; 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: in-reply-to:in-reply-to:references:references; bh=EwwsizA8wZLAMhtY0I3uDrT+BvYuFUdgkFyXW4YBq/M=; b=V4p4PyoIPA7tBtVnsSJZUW+zOiBJvHADsj4Yesd44ATNrNGMnBTnPSBCeJO+da+Eg+1I7w WPN46nyOS963lOFMfeLWW3YGtqQUaf/fvpO2emCwgKlJG2U0utQD2AvLQANqMNWtHVcFo+ PrbReD6vqZQ3TwGpND0ySJWrp5uRWuU= 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-469-inHlReUJOVGvbR3Kl8N4EQ-1; Mon, 07 Sep 2020 07:09:44 -0400 X-MC-Unique: inHlReUJOVGvbR3Kl8N4EQ-1 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 mimecast-mx01.redhat.com (Postfix) with ESMTPS id 380191084C8A; Mon, 7 Sep 2020 11:09:43 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-114-154.ams2.redhat.com [10.36.114.154]) by smtp.corp.redhat.com (Postfix) with ESMTP id 411337E43C; Mon, 7 Sep 2020 11:09:42 +0000 (UTC) From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PULL 01/64] block: Raise an error when backing file parameter is an empty string Date: Mon, 7 Sep 2020 13:08:33 +0200 Message-Id: <20200907110936.261684-2-kwolf@redhat.com> In-Reply-To: <20200907110936.261684-1-kwolf@redhat.com> References: <20200907110936.261684-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=kwolf@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=kwolf@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/07 02:54:37 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -21 X-Spam_score: -2.2 X-Spam_bar: -- X-Spam_report: (-2.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.1, 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_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable 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, peter.maydell@linaro.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" From: Connor Kuehl Providing an empty string for the backing file parameter like so: qemu-img create -f qcow2 -b '' /tmp/foo allows the flow of control to reach and subsequently fail an assert statement because passing an empty string to bdrv_get_full_backing_filename_from_filename() simply results in NULL being returned without an error being raised. To fix this, let's check for an empty string when getting the value from the opts list. Reported-by: Attila Fazekas Fixes: https://bugzilla.redhat.com/1809553 Signed-off-by: Connor Kuehl Message-Id: <20200813134722.802180-1-ckuehl@redhat.com> Signed-off-by: Kevin Wolf --- block.c | 4 ++++ tests/qemu-iotests/049 | 4 ++++ tests/qemu-iotests/049.out | 5 +++++ 3 files changed, 13 insertions(+) diff --git a/block.c b/block.c index 2ba76b2c36..b204b93a2e 100644 --- a/block.c +++ b/block.c @@ -6119,6 +6119,10 @@ void bdrv_img_create(const char *filename, const char *fmt, "same filename as the backing file"); goto out; } + if (backing_file[0] == '\0') { + error_setg(errp, "Expected backing file name, got empty string"); + goto out; + } } backing_fmt = qemu_opt_get(opts, BLOCK_OPT_BACKING_FMT); diff --git a/tests/qemu-iotests/049 b/tests/qemu-iotests/049 index 051a1c79e0..82b1e6c202 100755 --- a/tests/qemu-iotests/049 +++ b/tests/qemu-iotests/049 @@ -119,6 +119,10 @@ test_qemu_img create -f $IMGFMT -o compat=1.1,lazy_refcounts=on "$TEST_IMG" 64M test_qemu_img create -f $IMGFMT -o compat=0.10,lazy_refcounts=off "$TEST_IMG" 64M test_qemu_img create -f $IMGFMT -o compat=0.10,lazy_refcounts=on "$TEST_IMG" 64M +echo "== Expect error when backing file name is empty string ==" +echo +test_qemu_img create -f $IMGFMT -b '' $TEST_IMG 1M + # success, all done echo "*** done" rm -f $seq.full diff --git a/tests/qemu-iotests/049.out b/tests/qemu-iotests/049.out index a7e220830d..b1d8fd9107 100644 --- a/tests/qemu-iotests/049.out +++ b/tests/qemu-iotests/049.out @@ -209,4 +209,9 @@ qemu-img create -f qcow2 -o compat=0.10,lazy_refcounts=on TEST_DIR/t.qcow2 64M Formatting 'TEST_DIR/t.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=67108864 compat=0.10 lazy_refcounts=on refcount_bits=16 qemu-img: TEST_DIR/t.qcow2: Lazy refcounts only supported with compatibility level 1.1 and above (use version=v3 or greater) +== Expect error when backing file name is empty string == + +qemu-img create -f qcow2 -b TEST_DIR/t.qcow2 1M +qemu-img: TEST_DIR/t.qcow2: Expected backing file name, got empty string + *** done