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Mon, 12 Oct 2026 08:29:51 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (smtpav02.fra02v.mail.ibm.com [10.20.54.101]) by smtprelay01.fra02v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 69C8TlrI40567208 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 12 Oct 2026 08:29:47 GMT Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 55E7A2004B; Mon, 12 Oct 2026 08:29:47 +0000 (GMT) Received: from smtpav02.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B01A320043; Mon, 12 Oct 2026 08:29:44 +0000 (GMT) Received: from li-fbf77acc-29ba-11b2-a85c-e8e934f50a46.ibmuc.com (unknown [9.39.28.91]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 12 Oct 2026 08:29:44 +0000 (GMT) From: Gautam Menghani To: maddy@linux.ibm.com, npiggin@gmail.com, mpe@ellerman.id.au, chleroy@kernel.org, sshegde@linux.ibm.com, amachhiw@linux.ibm.com Cc: linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH v3 3/4] KVM: PPC: Book3S HV: XICS: Avoid NULL ptr deref in kvmppc_xive_cleanup_vcpu() Date: Mon, 12 Oct 2026 13:59:19 +0530 Message-ID: <20261012082922.218799-4-gautam@linux.ibm.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261012082922.218799-1-gautam@linux.ibm.com> References: <20261012082922.218799-1-gautam@linux.ibm.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-GUID: E6FkFc5lJdHulTY41z7ZBupEsn7Kn9tN X-Proofpoint-ORIG-GUID: TFHuhYM2uPHaOR87y_dagTQqV2B3CRYN X-Authority-Analysis: v=2.4 cv=aqInmiZV c=1 sm=1 tr=0 ts=6acc9a80 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=660iZSQnnn4A:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=U7nrCbtTmkRpXpFmAIza:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=tG5QLYm-1oz9L0MxXuoA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYxMDEyMDAzMiBTYWx0ZWRfX3FAueNjvOx2k 3hcUxjfGqXe/GaN7zWjeksitRi4lje82F3e52gRNpUl6rIjshNSAJAtfVYscHHnxGhy4LikBPf6 TngVDzvZJ2vjsTSOPvXBqXLLiY2O6ak= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYxMDEyMDAzMiBTYWx0ZWRfX+W1LwoOonPS8 ZV1RNS8BqGv3/WoSi8wxVteqLu6bvPpEHcDaley7jww/fHzAWcUEvnVd+KtYu1AfjVBPP+Q1RPT bJPoY4njtqitlx96xw8fWfdDzj1LLyCdaIvuiYNzqcdTw92XuiudYb/MmV5Wq3Tjy6Qs/Yhmipb p8D7slOPaLLbWM7o635Bak//fTsRriYWlg+IGovIbyWG21waVwI96+boZP8y2jZ8FskZnoYpDxx NSIGzlHySOB/8DaqsFOgCteRNDWaxomwWd3MNCS0EuE82MzS3CgjwnWLcTrM0vl8UYtwMoFL8x9 EZIb3fEdpq4UnKV/FzxmyRvPFmHb+EY3+g7FU0B3bIIGK6dCB48uSv7pXFPIMWlKFAv6G5YIgMn 2ZQ73hXhEthUI4aLHalMB33Jezb8f5hOTY/SVSFOS0oecqYUwwvE/Rw4+Zt172wZw8pyNkz23AA pUBYtUGqQ2dYHoTbXqA== 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=2026-10-12_02,2026-10-09_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 clxscore=1015 spamscore=0 malwarescore=0 suspectscore=0 bulkscore=0 adultscore=0 impostorscore=0 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2610080000 definitions=main-2610120032 In kvmppc_xive_connect_vcpu() if there is a failure before xc->vp_ipi_data is setup, it can result in a NULL pointer dereference in kvmppc_xive_cleanup_vcpu() when accessing the MMIO page in xive_vm_esb_load(). Fix this by adding a check before masking the VP IPI before accessing the MMIO pages. Fixes: 5af50993850a ("KVM: PPC: Book3S HV: Native usage of the XIVE interrupt controller") Cc: stable@vger.kernel.org # 4.12+ Signed-off-by: Gautam Menghani --- v3: 1. Add some more info to the patch description. v2: 1. New patch - Introduced to fix the scenario where NULL ptr deref is possible. (Sashiko) arch/powerpc/kvm/book3s_xive.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_xive.c b/arch/powerpc/kvm/book3s_xive.c index 67219044fb8c..b27127c43315 100644 --- a/arch/powerpc/kvm/book3s_xive.c +++ b/arch/powerpc/kvm/book3s_xive.c @@ -1818,7 +1818,8 @@ void kvmppc_xive_cleanup_vcpu(struct kvm_vcpu *vcpu) kvmppc_xive_disable_vcpu_interrupts(vcpu); /* Mask the VP IPI */ - xive_vm_esb_load(&xc->vp_ipi_data, XIVE_ESB_SET_PQ_01); + if (xc->vp_ipi_data.eoi_mmio) + xive_vm_esb_load(&xc->vp_ipi_data, XIVE_ESB_SET_PQ_01); /* Free escalations */ for (i = 0; i < KVMPPC_XIVE_Q_COUNT; i++) { -- 2.54.0