* [PATCH AUTOSEL 4.9 2/7] ACPI / hotplug / PCI: Fix reference count leak in enable_slot()
[not found] <20210512180545.665946-1-sashal@kernel.org>
@ 2021-05-12 18:05 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-05-12 18:05 UTC (permalink / raw)
To: linux-kernel, stable
Cc: Feilong Lin, Zhiqiang Liu, Bjorn Helgaas, Rafael J . Wysocki,
Sasha Levin, linux-acpi, linux-pci
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 7f2b9ef185e4..f154b05f467f 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -538,6 +538,7 @@ static void enable_slot(struct acpiphp_slot *slot)
slot->flags &= (~SLOT_ENABLED);
continue;
}
+ pci_dev_put(dev);
}
}
--
2.30.2
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