From nobody Fri Dec 19 20:13:30 2025 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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; Authentication-Results: mx.zohomail.com; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1554155179757838.2060850815839; Mon, 1 Apr 2019 14:46:19 -0700 (PDT) Received: from localhost ([127.0.0.1]:49174 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB4ky-00008s-Ho for importer@patchew.org; Mon, 01 Apr 2019 17:46:16 -0400 Received: from eggs.gnu.org ([209.51.188.92]:41642) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1hB45M-000285-JH for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:03:17 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1hB45L-0003vl-Hp for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:03:16 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:49240) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1hB45L-0003oY-6m for qemu-devel@nongnu.org; Mon, 01 Apr 2019 17:03:15 -0400 Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x31KrcmM128186 for ; Mon, 1 Apr 2019 17:03:03 -0400 Received: from e33.co.us.ibm.com (e33.co.us.ibm.com [32.97.110.151]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rkq85hrfh-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 01 Apr 2019 17:03:00 -0400 Received: from localhost by e33.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 1 Apr 2019 22:02:02 +0100 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08025.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x31L21xJ17826016 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 1 Apr 2019 21:02:01 GMT Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B151E6A04F; Mon, 1 Apr 2019 21:02:01 +0000 (GMT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7D7446A054; Mon, 1 Apr 2019 21:02:01 +0000 (GMT) Received: from localhost (unknown [9.80.94.43]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Mon, 1 Apr 2019 21:02:01 +0000 (GMT) From: Michael Roth To: qemu-devel@nongnu.org Date: Mon, 1 Apr 2019 15:59:09 -0500 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> References: <20190401210011.16009-1-mdroth@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19040121-0036-0000-0000-00000AA31DD4 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010857; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000283; SDB=6.01182941; UDB=6.00619269; IPR=6.00963683; MB=3.00026249; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-01 21:02:04 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040121-0037-0000-0000-00004B3CB188 Message-Id: <20190401210011.16009-36-mdroth@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2019-04-01_06:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904010135 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] X-Received-From: 148.163.156.1 Subject: [Qemu-devel] [PATCH 35/97] block: Fix use after free error in bdrv_open_inherit() 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: Kevin Wolf , Alberto Garcia , qemu-stable@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Alberto Garcia When a block device is opened with BDRV_O_SNAPSHOT and the bdrv_append_temp_snapshot() call fails then the error code path tries to unref the already destroyed 'options' QDict. This can be reproduced easily by setting TMPDIR to a location where the QEMU process can't write: $ TMPDIR=3D/nonexistent $QEMU -drive driver=3Dnull-co,snapshot=3Don Signed-off-by: Alberto Garcia Signed-off-by: Kevin Wolf (cherry picked from commit 8961be33e8ca7e809c603223803ea66ef7ea5be7) Signed-off-by: Michael Roth --- block.c | 1 + 1 file changed, 1 insertion(+) diff --git a/block.c b/block.c index 39f373e035..a7f6a13a74 100644 --- a/block.c +++ b/block.c @@ -2787,6 +2787,7 @@ static BlockDriverState *bdrv_open_inherit(const char= *filename, bdrv_parent_cb_change_media(bs, true); =20 qobject_unref(options); + options =3D NULL; =20 /* For snapshot=3Don, create a temporary qcow2 overlay. bs points to t= he * temporary snapshot afterwards. */ --=20 2.17.1