Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [ 25/38] PCI: Fix refcount issue in pci_create_root_bus() error recovery path | Date | Thu, 18 Jul 2013 22:21:41 -0700 |
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3.9-stable review patch. If anyone has any objections, please let me know.
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From: Jiang Liu <liuj97@gmail.com>
commit 343df771e671d821478dd3ef525a0610b808dbf8 upstream.
After calling device_register(&bridge->dev), the bridge is reference- counted, and it is illegal to call kfree() on it except in the release function.
[bhelgaas: changelog, use put_device() after device_register() failure] Signed-off-by: Jiang Liu <jiang.liu@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/pci/probe.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1694,12 +1694,16 @@ struct pci_bus *pci_create_root_bus(stru bridge->dev.release = pci_release_bus_bridge_dev; dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus); error = pcibios_root_bridge_prepare(bridge); - if (error) - goto bridge_dev_reg_err; + if (error) { + kfree(bridge); + goto err_out; + } error = device_register(&bridge->dev); - if (error) - goto bridge_dev_reg_err; + if (error) { + put_device(&bridge->dev); + goto err_out; + } b->bridge = get_device(&bridge->dev); device_enable_async_suspend(b->bridge); pci_set_bus_of_node(b); @@ -1753,8 +1757,6 @@ struct pci_bus *pci_create_root_bus(stru class_dev_reg_err: put_device(&bridge->dev); device_unregister(&bridge->dev); -bridge_dev_reg_err: - kfree(bridge); err_out: kfree(b); return NULL;
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