This is a note to let you know that I've just added the patch titled
ACPI / hotplug / PCI: Fix reference count leak in enable_slot()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-hotplug-pci-fix-reference-count-leak-in-enable_.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e1cc8e9bbd9f7353446d353687066d4130031655
Author: Feilong Lin <linfeilong@xxxxxxxxxx>
Date: Thu Mar 25 15:26:00 2021 +0800
ACPI / hotplug / PCI: Fix reference count leak in enable_slot()
[ 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@xxxxxxxxxx
Signed-off-by: Feilong Lin <linfeilong@xxxxxxxxxx>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx>
Signed-off-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c
index 6e60b4b1bf53..98be06ac2af2 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -540,6 +540,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge)
slot->flags &= ~SLOT_ENABLED;
continue;
}
+ pci_dev_put(dev);
}
}
