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PCI: mediatek: Add missing of_node_put() to fix reference leak 

[ Upstream commit 42814c438aac79746d310f413a27d5b0b959c5de ]

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.

Link: https://lore.kernel.org/r/20210120184810.3068794-1-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Krzysztof Wilczyński 2021-01-20 18:48:10 +00:00 committed by Greg Kroah-Hartman
parent d54c77959e
commit e622e01d44
1 changed files with 5 additions and 2 deletions
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7
drivers/pci/controller/pcie-mediatek.c
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@ -1063,14 +1063,14 @@ 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);
@ -1086,6 +1086,9 @@ 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)