linux-kernel - [PATCH] PCI: microchip: Fix refcount leak in mc_pcie_init_irq

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Date:   Sun,  5 Jun 2022 09:51:23 +0400
From:   Miaoqian Lin <linmq006@...il.com>
To:     Daire McNamara <daire.mcnamara@...rochip.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH] PCI: microchip: Fix refcount leak in mc_pcie_init_irq_domains

of_get_next_child() returns a node pointer with refcount incremented,
we should use of_node_put() on it when not need anymore.
This function only call of_node_put() in normal path,
missing it in some error paths.
Add missing of_node_put() to avoid refcount leak.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip PolarFire PCIe controller driver")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
---
 drivers/pci/controller/pcie-microchip-host.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
index dd5dba419047..7263d175b5ad 100644
--- a/drivers/pci/controller/pcie-microchip-host.c
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -904,6 +904,7 @@ static int mc_pcie_init_irq_domains(struct mc_pcie *port)
 						   &event_domain_ops, port);
 	if (!port->event_domain) {
 		dev_err(dev, "failed to get event domain\n");
+		of_node_put(pcie_intc_node);
 		return -ENOMEM;
 	}
 
@@ -913,6 +914,7 @@ static int mc_pcie_init_irq_domains(struct mc_pcie *port)
 						  &intx_domain_ops, port);
 	if (!port->intx_domain) {
 		dev_err(dev, "failed to get an INTx IRQ domain\n");
+		of_node_put(pcie_intc_node);
 		return -ENOMEM;
 	}
 
-- 
2.25.1