linux-kernel - [PATCH] PCI: xgene-msi: Fix a potential UAF in xgene_msi

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Date:   Tue, 26 Sep 2023 10:59:36 +0800
From:   Dinghao Liu <dinghao.liu@....edu.cn>
To:     dinghao.liu@....edu.cn
Cc:     Toan Le <toan@...amperecomputing.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Duc Dang <dhdang@....com>,
        Marc Zyngier <maz@...nel.org>,
        Tanmay Inamdar <tinamdar@....com>, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PCI: xgene-msi: Fix a potential UAF in xgene_msi_probe

xgene_allocate_domains() will call irq_domain_remove() to free
msi->inner_domain on failure. However, its caller, xgene_msi_probe(),
will also call irq_domain_remove() through xgene_msi_remove() on the
same failure, which may lead to a use-after-free. Remove the first
irq_domain_remove() and let xgene_free_domains() cleanup domains.

Fixes: dcd19de36775 ("PCI: xgene: Add APM X-Gene v1 PCIe MSI/MSIX termination driver")
Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
---

Changelog:

v2: -Remove irq_domain_remove() instead of nulling msi_domain.
---
 drivers/pci/controller/pci-xgene-msi.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c
index 3ce38dfd0d29..0f9b9394399d 100644
--- a/drivers/pci/controller/pci-xgene-msi.c
+++ b/drivers/pci/controller/pci-xgene-msi.c
@@ -251,10 +251,8 @@ static int xgene_allocate_domains(struct xgene_msi *msi)
 						    &xgene_msi_domain_info,
 						    msi->inner_domain);
 
-	if (!msi->msi_domain) {
-		irq_domain_remove(msi->inner_domain);
+	if (!msi->msi_domain)
 		return -ENOMEM;
-	}
 
 	return 0;
 }
-- 
2.17.1