From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8376C432C0 for ; Wed, 27 Nov 2019 20:19:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BB4B92084D for ; Wed, 27 Nov 2019 20:19:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727399AbfK0UTS (ORCPT ); Wed, 27 Nov 2019 15:19:18 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:21562 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726716AbfK0UTS (ORCPT ); Wed, 27 Nov 2019 15:19:18 -0500 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xARKETAQ050538; Wed, 27 Nov 2019 15:19:02 -0500 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 2whhyg0s9t-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 27 Nov 2019 15:19:02 -0500 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id xARKJ2I9060582; Wed, 27 Nov 2019 15:19:02 -0500 Received: from ppma01wdc.us.ibm.com (fd.55.37a9.ip4.static.sl-reverse.com [169.55.85.253]) by mx0a-001b2d01.pphosted.com with ESMTP id 2whhyg0s9e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 27 Nov 2019 15:19:02 -0500 Received: from pps.filterd (ppma01wdc.us.ibm.com [127.0.0.1]) by ppma01wdc.us.ibm.com (8.16.0.27/8.16.0.27) with SMTP id xARKFHQ9025850; Wed, 27 Nov 2019 20:19:05 GMT Received: from b01cxnp23033.gho.pok.ibm.com (b01cxnp23033.gho.pok.ibm.com [9.57.198.28]) by ppma01wdc.us.ibm.com with ESMTP id 2wevd6ftqw-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 27 Nov 2019 20:19:05 +0000 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp23033.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xARKJ0aT39191020 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 27 Nov 2019 20:19:00 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5BB4F112067; Wed, 27 Nov 2019 20:19:00 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D0F34112063; Wed, 27 Nov 2019 20:18:58 +0000 (GMT) Received: from leobras.br.ibm.com (unknown [9.18.235.137]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Wed, 27 Nov 2019 20:18:58 +0000 (GMT) Message-ID: <7dd89f27e886fc73e3de4d2a92e27f443978f318.camel@linux.ibm.com> Subject: Re: [PATCH 1/1] powerpc/kvm/book3s: Fixes possible 'use after release' of kvm From: Leonardo Bras To: Paolo Bonzini , Sean Christopherson , kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: Paul Mackerras , Benjamin Herrenschmidt , Michael Ellerman , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= Date: Wed, 27 Nov 2019 17:18:57 -0300 In-Reply-To: References: <20191126175212.377171-1-leonardo@linux.ibm.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-svLp0XGwOGKrM1lqBRkB" User-Agent: Evolution 3.34.1 (3.34.1-1.fc31) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-11-27_04:2019-11-27,2019-11-27 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 bulkscore=0 phishscore=0 impostorscore=0 mlxlogscore=934 spamscore=0 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911270162 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-svLp0XGwOGKrM1lqBRkB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2019-11-27 at 17:40 +0100, Paolo Bonzini wrote: > > =20 > > if (ret >=3D 0) > > list_add_rcu(&stt->list, &kvm->arch.spapr_tce_tables); > > - else > > - kvm_put_kvm(kvm); > > =20 > > mutex_unlock(&kvm->lock); > > =20 > > if (ret >=3D 0) > > return ret; > > =20 > > + kvm_put_kvm(kvm); > > kfree(stt); > > fail_acct: > > account_locked_vm(current->mm, kvmppc_stt_pages(npages), false); >=20 > This part is a good change, as it makes the code clearer. The > virt/kvm/kvm_main.c bits, however, are not necessary as explained by Sean= . >=20 Thanks! So, like this patch? https://lkml.org/lkml/2019/11/7/763 Best regards, Leonardo --=-svLp0XGwOGKrM1lqBRkB Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEMdeUgIzgjf6YmUyOlQYWtz9SttQFAl3e2jEACgkQlQYWtz9S ttTWzxAAy+Q8kuOW+58Zujf5Pl1VAPNeOj8APWTSfbtEtYh+qeriS0Fx+MlwfycO jKea8M8pTxuNFG88V9+rQM+qciE5UpqGYqTPkbhHEsrXYcBRPct/bS6/EmYc5wve MeTLOTW11fnZYR9WXghKpPhM2AOCvBYPMq3nnQUFqr0DLk7tkOB7OuHk9qASTVbH dZvU9rXIIMa5cxH4v0/qEZtzY+9/UStvDUM3cghd9p0DqDtGL396wIQwvRMfxT94 KP925KeLoi1wqIAH7VUxgrP8/SkLPfgMwG1QuyIiWO2cqHE9MpozjDU9hOebXoyb UVJngHT/oRyG7plHLcZ6eedy75M6Z4lKv3oviezjEjIRr8pC7/xT2MZYiV3dox9c rd9KgDTLihHEBfKmKnocErwvEleu9Dr6vJ6zBU1bWOahROryvuPdZ00SbVGZIa0U MFyIinaBDLWwn6zhpGZVc1vUqy1lmJnS91116u+og30IgwXMYpb6sHFUWmr9B0Ai 40tdEGnFKthSCeyskqBrLab4ykV49MLJxd9cK4kwnWou1M6Fl1kDY86h1P6afqEG RAbTtL4HCmOButVZjP5kzTnONkIZWLSmkibqSx4Gxl9Lw2u+jg523Ds9Ye2Pfqrd NARjPJb+1h6PU2IiDLmoC7r+axcI+Np+xacERZEOFo51lE0wI/c= =CM/a -----END PGP SIGNATURE----- --=-svLp0XGwOGKrM1lqBRkB--