linux-kernel - [PATCH 2/4] PCI: pciehp: bail out if pci_hp_add

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Message-Id: <401e4044e05d52e4243ca7faa65d5ec8b19526b8.1714762038.git.namcao@linutronix.de>
Date: Fri,  3 May 2024 21:23:20 +0200
From: Nam Cao <namcao@...utronix.de>
To: Bjorn Helgaas <bhelgaas@...gle.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rajesh Shah <rajesh.shah@...el.com>,
	linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Nam Cao <namcao@...utronix.de>,
	stable@...r.kernel.org
Subject: [PATCH 2/4] PCI: pciehp: bail out if pci_hp_add_bridge() fails

If there is no bus number available for the downstream bus of the
hot-plugged bridge, pci_hp_add_bridge() will fail. The driver proceeds
regardless, and the kernel crashes.

Abort if pci_hp_add_bridge() fails.

Fixes: 0eb3bcfd088e ("[PATCH] pciehp: allow bridged card hotplug")
Signed-off-by: Nam Cao <namcao@...utronix.de>
Cc: Rajesh Shah <rajesh.shah@...el.com>
Cc: <stable@...r.kernel.org>
---
 drivers/pci/hotplug/pciehp_pci.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_pci.c b/drivers/pci/hotplug/pciehp_pci.c
index ad12515a4a12..faf4fcf2fbdf 100644
--- a/drivers/pci/hotplug/pciehp_pci.c
+++ b/drivers/pci/hotplug/pciehp_pci.c
@@ -58,8 +58,13 @@ int pciehp_configure_device(struct controller *ctrl)
 		goto out;
 	}
 
-	for_each_pci_bridge(dev, parent)
-		pci_hp_add_bridge(dev);
+	for_each_pci_bridge(dev, parent) {
+		if (pci_hp_add_bridge(dev)) {
+			pci_stop_and_remove_bus_device(dev);
+			ret = -EINVAL;
+			goto out;
+		}
+	}
 
 	pci_assign_unassigned_bridge_resources(bridge);
 	pcie_bus_configure_settings(parent);
-- 
2.39.2