linux-kernel - [PATCH 5.18 0567/1095] PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq

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Date:   Mon, 15 Aug 2022 19:59:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Miaoqian Lin <linmq006@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Jianjun Wang <jianjun.wang@...iatek.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 0567/1095] PCI: mediatek-gen3: Fix refcount leak in mtk_pcie_init_irq_domains()

From: Miaoqian Lin <linmq006@...il.com>

[ Upstream commit bf038503d5fe90189743124233fe7aeb0984e961 ]

of_get_child_by_name() returns a node pointer with refcount incremented, so
we should use of_node_put() on it when we don't need it anymore.

Add missing of_node_put() to avoid refcount leak.

Fixes: 814cceebba9b ("PCI: mediatek-gen3: Add INTx support")
Link: https://lore.kernel.org/r/20220601041259.56185-1-linmq006@gmail.com
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
Reviewed-by: Miles Chen <miles.chen@...iatek.com>
Acked-by: Jianjun Wang <jianjun.wang@...iatek.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/controller/pcie-mediatek-gen3.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index 5d9fd36b02d1..a02c466a597c 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -600,7 +600,8 @@ static int mtk_pcie_init_irq_domains(struct mtk_gen3_pcie *pcie)
 						  &intx_domain_ops, pcie);
 	if (!pcie->intx_domain) {
 		dev_err(dev, "failed to create INTx IRQ domain\n");
-		return -ENODEV;
+		ret = -ENODEV;
+		goto out_put_node;
 	}
 
 	/* Setup MSI */
@@ -623,13 +624,15 @@ static int mtk_pcie_init_irq_domains(struct mtk_gen3_pcie *pcie)
 		goto err_msi_domain;
 	}
 
+	of_node_put(intc_node);
 	return 0;
 
 err_msi_domain:
 	irq_domain_remove(pcie->msi_bottom_domain);
 err_msi_bottom_domain:
 	irq_domain_remove(pcie->intx_domain);
-
+out_put_node:
+	of_node_put(intc_node);
 	return ret;
 }
 
-- 
2.35.1