[PATCH v2 2/2] PCI: Free the device name on the pci_setup_device() error path

[Rihyeon Kim <rihyeon8648@gmail.com>]

pci_setup_device() sets the device name with dev_set_name(), which
allocates it.  When the header type turns out to be unknown the function
returns -EIO, and pci_scan_device() then releases the device with kfree()
rather than put_device(), because the device has not been initialized with
device_initialize() yet.  The name is never freed, so it is leaked.

Free it there and clear the pointer, so the freed name is not left behind
in the kobject.

Yang Yingliang reported the same leak in 2022.

Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array")
Suggested-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/linux-pci/20220817084444.2876059-1-yangyingliang@huawei.com/
Assisted-by: Claude:claude-opus-5 sparse
Signed-off-by: Rihyeon Kim <rihyeon8648@gmail.com>
---
v2: new patch, picked up from Yang Yingliang's 2022 posting as suggested in
    review, with the NULL assignment added.

 drivers/pci/probe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3e6f0eb7d456..74d84093943b 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2192,6 +2192,8 @@ int pci_setup_device(struct pci_dev *dev)
 	default:				    /* unknown header */
 		pci_err(dev, "unknown header type %02x, ignoring device\n",
 			dev->hdr_type);
+		kfree_const(dev->dev.kobj.name);
+		dev->dev.kobj.name = NULL;
 		pci_release_of_node(dev);
 		return -EIO;
 
-- 
2.43.0