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PCI: Fix reference leak in pci_alloc_child_bus()

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commit 1f2768b6a3ee77a295106e3a5d68458064923ede upstream.

If device_register(&child->dev) fails, call put_device() to explicitly
release child->dev, per the comment at device_register().

Found by code review.

Link: https://lore.kernel.org/r/20250202062357.872971-1-make24@iscas.ac.cn
Fixes: 4f535093cf ("PCI: Put pci_dev in device tree as early as possible")
Signed-off-by: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ma Ke 2025-02-02 14:23:57 +08:00 • committed by Greg Kroah-Hartman
commit 7b4487b8c6
1 changed files with 4 additions and 1 deletions
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5
drivers/pci/probe.c
View file

@ -1041,7 +1041,10 @@ static struct pci_bus *pci_alloc_child_bus(struct pci_bus *parent,
add_dev:
pci_set_bus_msi_domain(child);
ret = device_register(&child->dev);
WARN_ON(ret < 0);
if (WARN_ON(ret < 0)) {
put_device(&child->dev);
return NULL;
}
pcibios_add_bus(child);