When device_register(&child->dev) failed, calling put_device() to explicitly release child->dev. Otherwise, it could cause double free problem.

Found by code review.

Cc: stable@vger.kernel.org Fixes: 4f535093cf8f ("PCI: Put pci_dev in device tree as early as possible") Signed-off-by: Ma Ke make_ruc2021@163.com --- Changes in v2: - modified the patch as suggestions. --- drivers/pci/probe.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 2e81ab0f5a25..a61070ce5f88 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1174,7 +1174,10 @@ 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 ERR_PTR(ret); + }

pcibios_add_bus(child);