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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0B93AC432C0 for ; Thu, 28 Nov 2019 17:16:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DECE221739 for ; Thu, 28 Nov 2019 17:16:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727142AbfK1RQX (ORCPT ); Thu, 28 Nov 2019 12:16:23 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:60758 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726587AbfK1RQW (ORCPT ); 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Thu, 28 Nov 2019 17:16:06 +0000 Received: from b03ledav005.gho.boulder.ibm.com (b03ledav005.gho.boulder.ibm.com [9.17.130.236]) by b03cxnp07029.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xASHG5og32833932 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 28 Nov 2019 17:16:05 GMT Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4ECD7BE053; Thu, 28 Nov 2019 17:16:05 +0000 (GMT) Received: from b03ledav005.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 626A6BE04F; Thu, 28 Nov 2019 17:16:03 +0000 (GMT) Received: from leobras.br.ibm.com (unknown [9.18.235.137]) by b03ledav005.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 28 Nov 2019 17:16:03 +0000 (GMT) Message-ID: <263e73be1047014ad3b6c0ae28d57db4b9dea970.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: Thu, 28 Nov 2019 14:15:59 -0300 In-Reply-To: References: <20191126175212.377171-1-leonardo@linux.ibm.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-l7jjVAuSfdlX1zRYI3pK" 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=2019-11-28_05:2019-11-28,2019-11-28 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 malwarescore=0 mlxscore=0 suspectscore=0 impostorscore=0 clxscore=1015 bulkscore=0 adultscore=0 priorityscore=1501 mlxlogscore=999 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911280146 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-l7jjVAuSfdlX1zRYI3pK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2019-11-27 at 17:40 +0100, Paolo Bonzini wrote: > > diff --git a/arch/powerpc/kvm/book3s_64_vio.c b/arch/powerpc/kvm/book3s= _64_vio.c > > index 5834db0a54c6..a402ead833b6 100644 > > --- a/arch/powerpc/kvm/book3s_64_vio.c > > +++ b/arch/powerpc/kvm/book3s_64_vio.c > > @@ -316,14 +316,13 @@ long kvm_vm_ioctl_create_spapr_tce(struct kvm *kv= m, > > =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); Paul, do you think this change is still valid as it 'makes the code clearer', as said by Paolo before? I would write a new commit message to match the change. Best regards, Leonardo --=-l7jjVAuSfdlX1zRYI3pK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iQIzBAABCAAdFiEEMdeUgIzgjf6YmUyOlQYWtz9SttQFAl3gAM8ACgkQlQYWtz9S ttTDJg//eBwp87AJa/nFXJRNohYve3mIdddUz+1Er3k4cXhuW3HWbrickBI+w+GM 5s3kXIywUHeAEPFuaqhCxDvM3YHf9cXbKUSO+vYipwnukAAx6xlrQA8squ0CuKKm Njbz4qBf9crM7lkH9S8vEFTvC46dUrClfPcdvQTPw0jPCknIPzpW9RdwjbJUC7q/ Woc0XfHhmvgwMHKI3Q1e7FEDIxYKZHDbvGhI2RN/+ROIvnsLcx/kdzrNE0LyhKfj hCfCfQ0i5LZwmUMh7bdGVb8qxuItuEMifrWZWjq0tly/KE0/1IrvRzWLG6uW4sTF gLRskMN2TQ3pAKHgTzqanYYkkBqh2VUTcPh6beVQP4qnSMzuEMR+AxA08NO1m2HQ s7l1GSiAVI+ae72YMUA8jcjoxnrcxKB+R5S39ZEXpoxoIsfYrx3QAiaBo2CyOrZL vD77YCthDMQ8Js4dINh4MMRgf0m95Pn4pD2BX5nD1L0NHHtD2paEayTapmBStaPR pBU9oTtajHcV7Fpo4Hq29Vj1Zl+Nbj101CnJknCoLy/7xT3Z5MnVHw3lYBAoN+hK sDG/XCfkWQ9+YkGda3LTjW2CxaTXHvpi2Y2BO2iHyULEZUZ+t8zyutd1v0pc6BiV lxjBZ9fbmQTQVOqWdueea85C7HVz/p7dohqQnwVLmCuMzCwB+cQ= =Kgb4 -----END PGP SIGNATURE----- --=-l7jjVAuSfdlX1zRYI3pK--