From: Wentao Liang <vulab@iscas.ac.cn>
To: robh@kernel.org, saravanak@kernel.org
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
Wentao Liang <vulab@iscas.ac.cn>,
stable@vger.kernel.org
Subject: [PATCH] of: unittest: fix use-after-free in testdrv_probe()
Date: Thu, 9 Apr 2026 03:48:59 +0000 [thread overview]
Message-ID: <20260409034859.429071-1-vulab@iscas.ac.cn> (raw)
The function testdrv_probe() retrieves the device_node from the PCI
device, applies an overlay, and then immediately calls of_node_put(dn).
This releases the reference held by the PCI core, potentially freeing
the node if the reference count drops to zero. Later, the same freed
pointer 'dn' is passed to of_platform_default_populate(), leading to a
use-after-free.
The reference to pdev->dev.of_node is owned by the device model and
should not be released by the driver. Remove the erroneous of_node_put()
to prevent premature freeing.
Fixes: 26409dd04589 ("of: unittest: Add pci_dt_testdrv pci driver")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
drivers/of/unittest.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index eae7ebdf5130..4078569a0f96 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -4317,7 +4317,6 @@ static int testdrv_probe(struct pci_dev *pdev, const struct pci_device_id *id)
size = info->dtbo_end - info->dtbo_begin;
ret = of_overlay_fdt_apply(info->dtbo_begin, size, &ovcs_id, dn);
- of_node_put(dn);
if (ret)
return ret;
--
2.34.1
reply other threads:[~2026-04-09 3:49 UTC|newest]
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