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of: unittest: Fix device reference count leak in of_unittest_pci_node_verify

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In of_unittest_pci_node_verify(), when the add parameter is false,
device_find_any_child() obtains a reference to a child device. This
function implicitly calls get_device() to increment the device's
reference count before returning the pointer. However, the caller
fails to properly release this reference by calling put_device(),
leading to a device reference count leak. Add put_device() in the else
branch immediately after child_dev is no longer needed.

As the comment of device_find_any_child states: "NOTE: you will need
to drop the reference with put_device() after use".

Found by code review.

Cc: stable@vger.kernel.org
Fixes: 26409dd045 ("of: unittest: Add pci_dt_testdrv pci driver")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
This commit is contained in:
Ma Ke
2025-09-30 16:16:18 +08:00
committed by Rob Herring (Arm)
parent 4e66293bb1
commit a8de554774
1 changed files with 1 additions and 0 deletions
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1
drivers/of/unittest.c
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@@ -4300,6 +4300,7 @@ static int of_unittest_pci_node_verify(struct pci_dev *pdev, bool add)
unittest(!np, "Child device tree node is not removed\n");
child_dev = device_find_any_child(&pdev->dev);
unittest(!child_dev, "Child device is not removed\n");
put_device(child_dev);
}
failed: