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From: Hongyan Xu <getshell@seu.edu.cn>
To: Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>,
	Daire McNamara <daire.mcnamara@microchip.com>,
	Conor Dooley <conor.dooley@microchip.com>,
	Robert Richter <rric@kernel.org>,
	Zhou Wang <wangzhou1@hisilicon.com>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Krzysztof Wilczynski <kwilczynski@kernel.org>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Rob Herring <robh@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, Hongyan Xu <getshell@seu.edu.cn>
Subject: [PATCH 2/3] PCI: microchip: Fix ECAM config window use-after-free
Date: Sun,  8 Nov 2026 18:56:38 +0800	[thread overview]
Message-ID: <20261108105640.875-3-getshell@seu.edu.cn> (raw)
In-Reply-To: <20261108105640.875-1-getshell@seu.edu.cn>

mc_host_probe() calls pci_host_common_probe() but has no ->remove, so an
unbind only runs devres_release_all(): gen_pci_unmap_cfg() ->
pci_ecam_free() frees the ECAM config window while the bus tree stays
registered - only pci_remove_bus() unlinks a bus, and only
pci_host_common_remove() reaches it for a root bus.  The next config access
is a use-after-free in pci_ecam_map_bus(), which reads cfg->ops->bus_shift.
Trigger: overlay rmdir in configfs, not rmmod (builtin_platform_driver()).

Fix: add .remove = pci_host_common_remove, as pci-host-generic.c does since
commit 01fcb7f777a9 ("PCI: Add support for unbinding the generic PCI host
controller"), so pci_remove_root_bus() unlinks the bus before devres frees
cfg.  Scope: the PLDA IRQ domains it creates are not devres managed and
stay unreleased - a separate, pre-existing issue.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
Cc: stable@vger.kernel.org
Signed-off-by: Hongyan Xu <getshell@seu.edu.cn>
---
 drivers/pci/controller/plda/pcie-microchip-host.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 24bbf93b8051..f7b75013d9fc 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -821,6 +821,7 @@ MODULE_DEVICE_TABLE(of, mc_pcie_of_match);
 
 static struct platform_driver mc_pcie_driver = {
 	.probe = mc_host_probe,
+	.remove = pci_host_common_remove,
 	.driver = {
 		.name = "microchip-pcie",
 		.of_match_table = mc_pcie_of_match,
-- 
2.50.1.windows.1


WARNING: multiple messages have this Message-ID (diff)
From: Hongyan Xu <getshell@seu.edu.cn>
To: Bjorn Helgaas <bhelgaas@google.com>, linux-pci@vger.kernel.org
Cc: Marc Zyngier <maz@kernel.org>,
	Daire McNamara <daire.mcnamara@microchip.com>,
	Conor Dooley <conor.dooley@microchip.com>,
	Robert Richter <rric@kernel.org>,
	Zhou Wang <wangzhou1@hisilicon.com>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	Krzysztof Wilczynski <kwilczynski@kernel.org>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Rob Herring <robh@kernel.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, Hongyan Xu <getshell@seu.edu.cn>
Subject: [PATCH 2/3] PCI: microchip: Fix ECAM config window use-after-free
Date: Sun,  8 Nov 2026 18:56:38 +0800	[thread overview]
Message-ID: <20261108105640.875-3-getshell@seu.edu.cn> (raw)
In-Reply-To: <20261108105640.875-1-getshell@seu.edu.cn>

mc_host_probe() calls pci_host_common_probe() but has no ->remove, so an
unbind only runs devres_release_all(): gen_pci_unmap_cfg() ->
pci_ecam_free() frees the ECAM config window while the bus tree stays
registered - only pci_remove_bus() unlinks a bus, and only
pci_host_common_remove() reaches it for a root bus.  The next config access
is a use-after-free in pci_ecam_map_bus(), which reads cfg->ops->bus_shift.
Trigger: overlay rmdir in configfs, not rmmod (builtin_platform_driver()).

Fix: add .remove = pci_host_common_remove, as pci-host-generic.c does since
commit 01fcb7f777a9 ("PCI: Add support for unbinding the generic PCI host
controller"), so pci_remove_root_bus() unlinks the bus before devres frees
cfg.  Scope: the PLDA IRQ domains it creates are not devres managed and
stay unreleased - a separate, pre-existing issue.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
Cc: stable@vger.kernel.org
Signed-off-by: Hongyan Xu <getshell@seu.edu.cn>
---
 drivers/pci/controller/plda/pcie-microchip-host.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 24bbf93b8051..f7b75013d9fc 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -821,6 +821,7 @@ MODULE_DEVICE_TABLE(of, mc_pcie_of_match);
 
 static struct platform_driver mc_pcie_driver = {
 	.probe = mc_host_probe,
+	.remove = pci_host_common_remove,
 	.driver = {
 		.name = "microchip-pcie",
 		.of_match_table = mc_pcie_of_match,
-- 
2.50.1.windows.1


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  parent reply	other threads:[~2026-11-08 10:56 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-08 10:56 [PATCH 0/3] PCI: Fix ECAM config window use-after-free in five drivers Hongyan Xu
2026-11-08 10:56 ` Hongyan Xu
2026-11-08 10:56 ` [PATCH 1/3] PCI: apple: Fix ECAM config window use-after-free Hongyan Xu
2026-11-08 10:56   ` Hongyan Xu
2026-11-08 11:14   ` sashiko-bot
2026-11-08 14:21   ` Marc Zyngier
2026-11-08 14:21     ` Marc Zyngier
2026-11-08 10:56 ` Hongyan Xu [this message]
2026-11-08 10:56   ` [PATCH 2/3] PCI: microchip: " Hongyan Xu
2026-11-08 11:06   ` sashiko-bot
2026-11-08 10:56 ` [PATCH 3/3] PCI: thunder-pem, hisi, thunder-ecam: " Hongyan Xu
2026-11-08 10:56   ` Hongyan Xu
2026-11-08 11:00   ` sashiko-bot

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