From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 1EA73527596; Wed, 30 Sep 2026 18:39:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793584; cv=none; b=bGiEbKJS3OxQmAr1bF3Y79fNoLYyOhabAIcBBVobW+sZZvcDXn3l8jOuZHuHXKe7AFNoDob9icbGpdQ6dDLmZyKThevrb6HuHDtF0x+amEQegzlVAIjsY7EY6d4as/rVX6sZrHk/gLZqdUPAzoS/a+pKYWPwXyBKDUiwZ2ZEUTY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790793584; c=relaxed/simple; bh=+qY0iCI/W+RSP5UnnPPCEvA9RvDictdLxwfh93iSYmo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hr7zySnQF1oDhbPsrK2RvaCX6DmdZ0xRN4fM6pVJqEL4eK/+D81iqdowNREKxzSr53XebNnsb+zmdNz8u024r1/EdT/8X39o9zu31RNRsfVfYTzKtnBaIpwFogLAibvSLtAGG8WLs0yjhTMIJUxecy1Pq7tyKnkIITLe3AUdVEs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mPmTYBJ5; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="mPmTYBJ5" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5B28A1F0089A; Wed, 30 Sep 2026 18:39:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1790793582; bh=NlY7/i+6aSRbs4uD8N9kAaGk+FT2PGogS13lybiCbVA=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=mPmTYBJ5u3d3O3cmi1soeai2/LvgYJ4iL7dR11yeCP2NYOMCqjj356j5NfAYsRA/X Ze9/6egYI/FFYz9k8OSEm2j1OEqTMkDam9dlWbRJpFnHSfSl9FNQEAeVrTk7cxDelw ulbuAKiJ/RMYdUHWKbRIhijcCR3GWsmOR37mFNLA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Niklas Schnelle , Benjamin Block , Farhan Ali , Heiko Carstens Subject: [PATCH 6.18 305/395] s390/pci: Fix leak of struct pci_dev reference in zpci_report_status() Date: Wed, 30 Sep 2026 17:29:27 +0200 Message-ID: <20260930152347.271880003@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260930152340.591469096@linuxfoundation.org> References: <20260930152340.591469096@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Niklas Schnelle commit 09b7040a1b79f4f61cdad6d9af972e045bb7c498 upstream. In zpci_report_status(), a reference to the pdev associated with the zdev being reported about is acquired using pci_get_slot(). This reference needs to be dropped with pci_dev_put(), but this call is missing, thus leaking the reference. On subsequent hot unplug, this will cause the struct pci_dev to not be released, leaking memory and preventing reattach. At the same time, the only existing caller already holds a pdev reference. So instead of reacquiring and then dropping another reference, simply pass the existing pdev pointer to zpci_report_status(). This gets rid of the need for pci_get_slot() as well as the zdev->zbus check. Cc: stable@vger.kernel.org Fixes: 4ec6054e7321 ("s390/pci: Report PCI error recovery results via SCLP") Signed-off-by: Niklas Schnelle Reviewed-by: Benjamin Block Reviewed-by: Farhan Ali Signed-off-by: Heiko Carstens Signed-off-by: Greg Kroah-Hartman --- arch/s390/pci/pci_event.c | 2 +- arch/s390/pci/pci_report.c | 11 +++++------ arch/s390/pci/pci_report.h | 4 +++- 3 files changed, 9 insertions(+), 8 deletions(-) --- a/arch/s390/pci/pci_event.c +++ b/arch/s390/pci/pci_event.c @@ -258,7 +258,7 @@ static pci_ers_result_t zpci_event_attem pci_uevent_ers(pdev, PCI_ERS_RESULT_RECOVERED); out_unlock: device_unlock(&pdev->dev); - zpci_report_status(zdev, "recovery", status_str); + zpci_report_status(zdev, pdev, "recovery", status_str); return ers_res; } --- a/arch/s390/pci/pci_report.c +++ b/arch/s390/pci/pci_report.c @@ -90,7 +90,8 @@ static struct debug_view debug_log_view /** * zpci_report_status - Report the status of operations on a PCI device - * @zdev: The PCI device for which to report status + * @zdev: The zPCI device for which to report status + * @pdev: The PCI device associated with the zdev if any, NULL otherwise * @operation: A string representing the operation reported * @status: A string representing the status of the operation * @@ -104,15 +105,15 @@ static struct debug_view debug_log_view * * Return: 0 on success an error code < 0 otherwise. */ -int zpci_report_status(struct zpci_dev *zdev, const char *operation, const char *status) +int zpci_report_status(struct zpci_dev *zdev, struct pci_dev *pdev, + const char *operation, const char *status) { struct zpci_report_error *report; struct pci_driver *driver = NULL; - struct pci_dev *pdev = NULL; char *buf, *end; int ret; - if (!zdev || !zdev->zbus) + if (!zdev) return -ENODEV; /* Protected virtualization hosts get nothing from us */ @@ -122,8 +123,6 @@ int zpci_report_status(struct zpci_dev * report = (void *)get_zeroed_page(GFP_KERNEL); if (!report) return -ENOMEM; - if (zdev->zbus->bus) - pdev = pci_get_slot(zdev->zbus->bus, zdev->devfn); if (pdev) driver = to_pci_driver(pdev->dev.driver); --- a/arch/s390/pci/pci_report.h +++ b/arch/s390/pci/pci_report.h @@ -8,9 +8,11 @@ */ #ifndef __S390_PCI_REPORT_H #define __S390_PCI_REPORT_H +#include struct zpci_dev; -int zpci_report_status(struct zpci_dev *zdev, const char *operation, const char *status); +int zpci_report_status(struct zpci_dev *zdev, struct pci_dev *pdev, + const char *operation, const char *status); #endif /* __S390_PCI_REPORT_H */