From patchwork Sat Nov 2 14:26:14 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zijun Hu X-Patchwork-Id: 13860171 X-Patchwork-Delegate: kw@linux.com Received: from pv50p00im-hyfv10011601.me.com (pv50p00im-hyfv10011601.me.com [17.58.6.43]) (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 69DC919E97B for ; Sat, 2 Nov 2024 14:26:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=17.58.6.43 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730557606; cv=none; b=fxOnLYqiBBmyq11k9z+1rzO1qlbyIFK+JECzPrKOAi7KsJBHD1TCYMBdZ3+XlEacqbVsH77LhkJiHeF4dioHf22CStq+HLYy4mdUGTveysst4xSGjHnGwEHZKOz3EwhvJHyHBf0L0VGiU7PIU+U2sGZ/QW4m02/NVDumqeN7Xr4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730557606; c=relaxed/simple; bh=YH4WCUvDQhlA5V+tnKNDDpoeRGfjbdZu7ibbvodAJKo=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Brcx2cC/aqgwHiC0oE+U6USxscV7pRPG2s+Na4p6DJm2hgiEGLppq+0DJz/5vTI68XxfoBn4UNpmj2fPzkW/mwcCA86NJ96n/+dP9xRilzb+7Jf73i5O/UB8dluv6/Pk/fNMgsOAuXYbsmdfUQa0wgYI7fdJAY17/5qrd1kWCmM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com; spf=pass smtp.mailfrom=icloud.com; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b=n7US4EuC; arc=none smtp.client-ip=17.58.6.43 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=icloud.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=icloud.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=icloud.com header.i=@icloud.com header.b="n7US4EuC" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=icloud.com; s=1a1hai; t=1730557605; bh=hJBRC+np90ciARpNEUyZqydq1Md0VJimI1Ghc+A/vug=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:To: x-icloud-hme; b=n7US4EuCibIETCrnEc5GpPySEKOmcZ3YSSZ74ljZtioCEoWnpRrJCHVJjDK1UCd9w DQpjjAF7R4fQGSOrWeeEW7qIRSqL0R22HYHvcKcUFYjidAZUdRIafUbFcg5GQH+lx5 Y87XXKuBGTCFi64mNyVCzFCZtcSL9t9syF7/0KLgVb7+tPwOi8VSTfnRDAsCMEnBBs XZK43wQQrra6zNTCWqaWqDuu9fqCKzDfc/DqiUWxHhNROj41V9hs0JCB5pcD4QBM87 Mv/yKEjr3cD23AQ8wBqI9o0ZHl+A9LUATxVO5AECZUB+wFjoUz5PtO05PjbqEDi5v4 8eh8S8dAxCwuQ== Received: from [192.168.1.26] (pv50p00im-dlb-asmtp-mailmevip.me.com [17.56.9.10]) by pv50p00im-hyfv10011601.me.com (Postfix) with ESMTPSA id 25AC6C80136; Sat, 2 Nov 2024 14:26:38 +0000 (UTC) From: Zijun Hu Date: Sat, 02 Nov 2024 22:26:14 +0800 Subject: [PATCH RFC 1/2] PCI: endpoint: Fix API pci_epc_destroy() releasing domain_nr ID faults Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241102-epc_rfc-v1-1-5026322df5bc@quicinc.com> References: <20241102-epc_rfc-v1-0-5026322df5bc@quicinc.com> In-Reply-To: <20241102-epc_rfc-v1-0-5026322df5bc@quicinc.com> To: Manivannan Sadhasivam , =?utf-8?q?Krzy?= =?utf-8?q?sztof_Wilczy=C5=84ski?= , Kishon Vijay Abraham I , Bjorn Helgaas , Frank Li , Lorenzo Pieralisi Cc: Zijun Hu , =?utf-8?q?Krzysztof_Wilczy=C5=84ski?= , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Zijun Hu , stable@vger.kernel.org X-Mailer: b4 0.14.1 X-Proofpoint-GUID: raVYR2rXgJaA_OrzGV8qOKSp4QcGVPJk X-Proofpoint-ORIG-GUID: raVYR2rXgJaA_OrzGV8qOKSp4QcGVPJk X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-11-02_12,2024-11-01_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 clxscore=1015 adultscore=0 mlxscore=0 mlxlogscore=872 malwarescore=0 spamscore=0 bulkscore=0 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2308100000 definitions=main-2411020128 X-Apple-Remote-Links: v=1;h=KCk=;charset=UTF-8 From: Zijun Hu pci_epc_destroy() invokes pci_bus_release_domain_nr() to release domain_nr ID, but the invocation has below 2 faults: - The later accesses device @epc->dev which has been kfree()ed by previous device_unregister(), namely, it is a UAF issue. - The later frees the domain_nr ID into @epc->dev, but the ID is actually allocated from @epc->dev.parent, so it will destroy domain_nr IDA. Fix by freeing the ID to @epc->dev.parent before unregistering @epc->dev. Fixes: 0328947c5032 ("PCI: endpoint: Assign PCI domain number for endpoint controllers") Cc: stable@vger.kernel.org Signed-off-by: Zijun Hu --- drivers/pci/endpoint/pci-epc-core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/pci/endpoint/pci-epc-core.c b/drivers/pci/endpoint/pci-epc-core.c index 17f007109255..bcc9bc3d6df5 100644 --- a/drivers/pci/endpoint/pci-epc-core.c +++ b/drivers/pci/endpoint/pci-epc-core.c @@ -837,11 +837,10 @@ EXPORT_SYMBOL_GPL(pci_epc_bus_master_enable_notify); void pci_epc_destroy(struct pci_epc *epc) { pci_ep_cfs_remove_epc_group(epc->group); - device_unregister(&epc->dev); - #ifdef CONFIG_PCI_DOMAINS_GENERIC - pci_bus_release_domain_nr(&epc->dev, epc->domain_nr); + pci_bus_release_domain_nr(epc->dev.parent, epc->domain_nr); #endif + device_unregister(&epc->dev); } EXPORT_SYMBOL_GPL(pci_epc_destroy);