| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 310/323] ACPI / hotplug / PCI: Fix reference count leak in enable_slot() | Date | Thu, 20 May 2021 11:23:22 +0200 |
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From: Feilong Lin <linfeilong@huawei.com>
[ Upstream commit 3bbfd319034ddce59e023837a4aa11439460509b ]
In enable_slot(), if pci_get_slot() returns NULL, we clear the SLOT_ENABLED flag. When pci_get_slot() finds a device, it increments the device's reference count. In this case, we did not call pci_dev_put() to decrement the reference count, so the memory of the device (struct pci_dev type) will eventually leak.
Call pci_dev_put() to decrement its reference count when pci_get_slot() returns a PCI device.
Link: https://lore.kernel.org/r/b411af88-5049-a1c6-83ac-d104a1f429be@huawei.com Signed-off-by: Feilong Lin <linfeilong@huawei.com> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@huawei.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- drivers/pci/hotplug/acpiphp_glue.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index f2c1008e0f76..40e936e3a480 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -509,6 +509,7 @@ static void enable_slot(struct acpiphp_slot *slot) slot->flags &= (~SLOT_ENABLED); continue; } + pci_dev_put(dev); } } -- 2.30.2
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