From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A43C1403AE6; Mon, 3 Aug 2026 14:13:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=148.163.156.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785766436; cv=none; b=ipGDWTFpSs9xOptPPoy7uS4AGlmd2vOf8n2IWcZa1c55jLpwZa+WyJFrbDOj19DOqfmkEj3tHtsd3Yl4L2ICAuT2t2HQ4JQ2n7XdPbNe3eaaP/W3eAlGFKGpzmDN8zpcs+7sWEUyhIji2ebYrg6SWbqJot3o3CPGnaIqlHDujWw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785766436; c=relaxed/simple; bh=IUgiuI5dQu8yeCl3P+r02WgX/nsq39eQuMppI51MJVM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=WarP/FmoDvYHEtS8H0Pv9VDlbdf125lxUqpMH7lgcjFPQfCzw8exfgCPGZpksrEacjXHQ4YXo5JJ1KDertPb1P/C6Cf0Zt7hbZGvztxJXsD4A1Aqi5bnHxy4nvprqpKo732qyIAlQdNEmrveRSnYjw3FuKW7lmjyg0bYU9om9MY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com; spf=pass smtp.mailfrom=linux.ibm.com; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b=l4yqY2A6; arc=none smtp.client-ip=148.163.156.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.ibm.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=ibm.com header.i=@ibm.com header.b="l4yqY2A6" Received: from pps.filterd (m0356517.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id 673DlX3Y2214380; Mon, 3 Aug 2026 14:13:52 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=pp1; bh=oL0oe0 a1m84O8qmrj0n3N4XdYR2npE4MkJlokWlkV6U=; b=l4yqY2A6rx+sSJ1ORrNUyp HN7riL44beZQ5k/PVL8OMH1MKp97H37EFZ9C5abNefYwyJg2W0/zwF1ia59zDNcd 37BXXxXbwtQ3gihCdcLFyNQ4ouXNoa0il+H569odSvUMgbjkHuiO6+ZVOIy0PrTs UDDw4MEDhvir6s1FtP88gSJUUfHADdnZHxPUwv0ztrvDKM8tGTnOGLFzqVJRuobK TAj/zobFJy49EG+vfiyLFwj3IxxLe5HeWIgDh8tsuGgWkqTmp/2h7uSnM150/F8A TW78MFNTy9UtsO+8DMjFlH+0fzB7S15vHNGu459+C08BJ89t4uE/cEpjH+etjVbQ == Received: from ppma22.wdc07v.mail.ibm.com (5c.69.3da9.ip4.static.sl-reverse.com [169.61.105.92]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 4fs8h4s6qh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 03 Aug 2026 14:13:52 +0000 (GMT) Received: from pps.filterd (ppma22.wdc07v.mail.ibm.com [127.0.0.1]) by ppma22.wdc07v.mail.ibm.com (8.18.1.7/8.18.1.7) with ESMTP id 673EDO5Z003966; Mon, 3 Aug 2026 14:13:51 GMT Received: from smtprelay06.fra02v.mail.ibm.com ([9.218.2.230]) by ppma22.wdc07v.mail.ibm.com (PPS) with ESMTPS id 4fsugvwtgq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Mon, 03 Aug 2026 14:13:51 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (smtpav03.fra02v.mail.ibm.com [10.20.54.102]) by smtprelay06.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 673EDixj30015926 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 3 Aug 2026 14:13:44 GMT Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B3A412004B; Mon, 3 Aug 2026 14:13:44 +0000 (GMT) Received: from smtpav03.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8E92120043; Mon, 3 Aug 2026 14:13:44 +0000 (GMT) Received: from [9.224.88.46] (unknown [9.224.88.46]) by smtpav03.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 3 Aug 2026 14:13:44 +0000 (GMT) Message-ID: Date: Mon, 3 Aug 2026 16:13:44 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 02/13] KVM: s390: Do not free SCA if it was not allocated To: Claudio Imbrenda , linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, david@kernel.org, seiden@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com References: <20260803124040.126471-1-imbrenda@linux.ibm.com> <20260803124040.126471-3-imbrenda@linux.ibm.com> Content-Language: en-US From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; keydata= xsFNBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABzSVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+wsF3BBMBCAAhBQJbm6Q+AhsjBQsJCAcCBhUI CQoLAgQWAgMBAh4BAheAAAoJEONU5rjiOLn4p9gQALjkdj5euJVI2nNT3/IAxAhQSmRhPEt0 AmnCYnuTcHRWPujNr5kqgtyER9+EMQ0ZkX44JU2q7OWxTdSNSAN/5Z7qmOR9JySvDOf4d3mS bMB5zxL9d8SbnSs1uW96H9ZBTlTQnmLfsiM9TetAjSrR8nUmjGhe2YUhJLR1v1LguME+YseT eXnLzIzqqpu311/eYiiIGcmaOjPCE+vFjcXL5oLnGUE73qSYiujwhfPCCUK0850o1fUAYq5p CNBCoKT4OddZR+0itKc/cT6NwEDwdokeg0+rAhxb4Rv5oFO70lziBplEjOxu3dqgIKbHbjza EXTb+mr7VI9O4tTdqrwJo2q9zLqqOfDBi7NDvZFLzaCewhbdEpDYVu6/WxprAY94hY3F4trT rQMHJKQENtF6ZTQc9fcT5I3gAmP+OEvDE5hcTALpWm6Z6SzxO7gEYCnF+qGXqp8sJVrweMub UscyLqHoqdZC2UG4LQ1OJ97nzDpIRe0g6oJ9ZIYHKmfw5jjwH6rASTld5MFWajWdNsqK15k/ RZnHAGICKVIBOBsq26m4EsBlfCdt3b/6emuBjUXR1pyjHMz2awWzCq6/6OWs5eANZ0sdosNq dq2v0ULYTazJz2rlCXV89qRa7ukkNwdBSZNEwsD4eEMicj1LSrqWDZMAALw50L4jxaMD7lPL jJbazsFNBFubpD4BEADAcUTRqXF/aY53OSH7IwIK9lFKxIm0IoFkOEh7LMfp7FGzaP7ANrZd cIzhZi38xyOkcaFY+npGEWvko7rlIAn0JpBO4x3hfhmhBD/WSY8LQIFQNNjEm3vzrMo7b9Jb JAqQxfbURY3Dql3GUzeWTG9uaJ00u+EEPlY8zcVShDltIl5PLih20e8xgTnNzx5c110lQSu0 iZv2lAE6DM+2bJQTsMSYiwKlwTuv9LI9Chnoo6+tsN55NqyMxYqJgElk3VzlTXSr3+rtSCwf tq2cinETbzxc1XuhIX6pu/aCGnNfuEkM34b7G1D6CPzDMqokNFbyoO6DQ1+fW6c5gctXg/lZ 602iEl4C4rgcr3+EpfoPUWzKeM8JXv5Kpq4YDxhvbitr8Dm8gr38+UKFZKlWLlwhQ56r/zAU v6LIsm11GmFs2/cmgD1bqBTNHHcTWwWtRTLgmnqJbVisMJuYJt4KNPqphTWsPY8SEtbufIlY HXOJ2lqUzOReTrie2u0qcSvGAbSfec9apTFl2Xko/ddqPcZMpKhBiXmY8tJzSPk3+G4tqur4 6TYAm5ouitJsgAR61Cu7s+PNuq/pTLDhK+6/Njmc94NGBcRA4qTuysEGE79vYWP2oIAU4Fv6 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABwsFfBBgBCAAJ BQJbm6Q+AhsMAAoJEONU5rjiOLn4DDEP/RuyckW65SZcPG4cMfNgWxZF8rVjeVl/9PBfy01K 8R0hajU40bWtXSMiby7j0/dMjz99jN6L+AJHJvrLz4qYRzn2Ys843W+RfXj62Zde4YNBE5SL jJweRCbMWKaJLj6499fctxTyeb9+AMLQS4yRSwHuAZLmAb5AyCW1gBcTWZb8ON5BmWnRqeGm IgC1EvCnHy++aBnHTn0m+zV89BhTLTUal35tcjUFwluBY39R2ux/HNlBO1GY3Z+WYXhBvq7q katThLjaQSmnOrMhzqYmdShP1leFTVbzXUUIYv/GbynO/YrL2gaQpaP1bEUEi8lUAfXJbEWG dnHFkciryi092E8/9j89DJg4mmZqOau7TtUxjRMlBcIliXkzSLUk+QvD4LK1kWievJse4mte FBdkWHfP4BH/+8DxapRcG1UAheSnSRQ5LiO50annOB7oXF+vgKIaie2TBfZxQNGAs3RQ+bga DchCqFm5adiSP5+OT4NjkKUeGpBe/aRyQSle/RropTgCi85pje/juYEn2P9UAgkfBJrOHvQ9 Z+2Sva8FRd61NJLkCJ4LFumRn9wQlX2icFbi8UDV3do0hXJRRYTWCxrHscMhkrFWLhYiPF4i phX7UNdOWBQ90qpHyAxHmDazdo27gEjfvsgYMdveKknEOTEb5phwxWgg7BcIDoJf9UMC In-Reply-To: <20260803124040.126471-3-imbrenda@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwODAzMDEyNCBTYWx0ZWRfXzMEkULtn0Jjw 7vQ5tRgJcdPKUkqPZpUjt4jg4av1QGZOcqyIZ7nQQvwYsZi0KpJQaWFgy1DSOEfNahTkB/YS3bV Wuk5Wdjn6GqWn8rE+/SDzz+f2xWsfL0= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwODAzMDEyNCBTYWx0ZWRfX+NwEMeJbinrm 7sUcVBu2V4c6aeF5lzqJ4ox6ltq7/Wymi/aYikkKf+ELxPUYRNPvO5rDQsF5xg0jxCXEwH+kUyS QPiZtuY4HMc0qLKMFwGL/RIe7y/XAe/aRua+Hgo3hc4gEbEjw++DZUXB1WgLLkB4SLlB6VLal33 J7H8HWnBzdbuytCzoGIRZmCuCRCl6THNCBUMNtvBsYvDA9Kg24wJpV4baRx9i8BnvqWcO5R+n5F l5iGe/qplMHfmdHI5V7tG3ZVkMJCSwF1GEW1cwGcgVv47Gkq61/0s6rIdSs1Y/mk1KyjlVVLjZ2 FQDzze6uVvLXB/jttsNmynw/a2ngPlsdAL9KBSEuVmT/ZPVRQQCLYRPwfyLgTMnRD2VFWX0Wf1q qrVsu40O8zAozQ7TC0Lvt/lDCSxLpRa3OrmVy1BdfWCgAxG/TBwKgJubI0B2PuxP+JVsq1IUxin tYg4vAF+vIHhqgJcfhw== X-Authority-Analysis: v=2.4 cv=SI1ykuvH c=1 sm=1 tr=0 ts=6a70a220 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=M5uM2SGDJJfKum1V:21 a=IkcTkHD0fZMA:10 a=Sv0fKeRqtYgA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VnNF1IyMAAAA:8 a=2HitSDPJqUxGu8htRZYA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: EEV39lBO2SnROxtYa-u73MwRmubjz3Xm X-Proofpoint-GUID: EEV39lBO2SnROxtYa-u73MwRmubjz3Xm X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1176,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-08-03_03,2026-08-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 bulkscore=0 suspectscore=0 impostorscore=0 spamscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2608030124 On 8/3/26 14:40, Claudio Imbrenda wrote: > If VM creation fails early in kvm_arch_init_vm(), the cleanup code > tries to free up the SCA, even though the address is 0. Due to using > free_pages_exact(), only the first page is skipped, accidentally > freeing pages 1, 2, and 3. > > Fix by checking whether the pointer is NULL before attempting to free > the SCA in sca_dispose(). > > Fixes: e72753ed1267 ("KVM: s390: Use ESCA instead of BSCA at VM init") > Signed-off-by: Claudio Imbrenda > --- > arch/s390/kvm/kvm-s390.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c > index f86b4b0b356f..1b3290a5ad1a 100644 > --- a/arch/s390/kvm/kvm-s390.c > +++ b/arch/s390/kvm/kvm-s390.c > @@ -3247,7 +3247,8 @@ static void kvm_s390_crypto_init(struct kvm *kvm) > > static void sca_dispose(struct kvm *kvm) > { > - free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca)); > + if (kvm->arch.sca) > + free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca)); > kvm->arch.sca = NULL; > } > uh, right, there's no null check in free_pages_exact() Reviewed-by: Janosch Frank