From: "Krzysztof Wilczyński" <kw@linux.com>
To: Matthias Brugger <matthias.bgg@gmail.com>
Cc: Rob Herring <robh@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
linux-pci@vger.kernel.org, Ryder Lee <ryder.lee@mediatek.com>,
linux-mediatek@lists.infradead.org,
Bjorn Helgaas <bhelgaas@google.com>,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] PCI: mediatek: Add missing of_node_put() to fix reference leak
Date: Wed, 20 Jan 2021 18:48:10 +0000 [thread overview]
Message-ID: <20210120184810.3068794-1-kw@linux.com> (raw)
The for_each_available_child_of_node helper internally makes use of the
of_get_next_available_child() which performs an of_node_get() on each
iteration when searching for next available child node.
Should an available child node be found, then it would return a device
node pointer with reference count incremented, thus early return from
the middle of the loop requires an explicit of_node_put() to prevent
reference count leak.
To stop the reference leak, explicitly call of_node_put() before
returning after an error occurred.
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
---
drivers/pci/controller/pcie-mediatek.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
index cf4c18f0c25a..23548b517e4b 100644
--- a/drivers/pci/controller/pcie-mediatek.c
+++ b/drivers/pci/controller/pcie-mediatek.c
@@ -1035,14 +1035,14 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
err = of_pci_get_devfn(child);
if (err < 0) {
dev_err(dev, "failed to parse devfn: %d\n", err);
- return err;
+ goto error_put_node;
}
slot = PCI_SLOT(err);
err = mtk_pcie_parse_port(pcie, child, slot);
if (err)
- return err;
+ goto error_put_node;
}
err = mtk_pcie_subsys_powerup(pcie);
@@ -1058,6 +1058,9 @@ static int mtk_pcie_setup(struct mtk_pcie *pcie)
mtk_pcie_subsys_powerdown(pcie);
return 0;
+error_put_node:
+ of_node_put(child);
+ return err;
}
static int mtk_pcie_probe(struct platform_device *pdev)
--
2.30.0
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next reply other threads:[~2021-01-20 18:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-20 18:48 Krzysztof Wilczyński [this message]
2021-01-25 17:34 ` [PATCH] PCI: mediatek: Add missing of_node_put() to fix reference leak Lorenzo Pieralisi
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