linux-kernel - [PATCH v2] ACPI / hotplug / PCI: fix memory leak in enable

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Message-ID: <b411af88-5049-a1c6-83ac-d104a1f429be@huawei.com>
Date:   Thu, 25 Mar 2021 15:26:00 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     <rjw@...ysocki.net>, <lenb@...nel.org>, <bhelgaas@...gle.com>
CC:     <linux-acpi@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linfeilong <linfeilong@...wei.com>, <liuzhiqiang26@...wei.com>
Subject: [PATCH v2] ACPI / hotplug / PCI: fix memory leak in enable_slot()

From: Feilong Lin <linfeilong@...wei.com>

In enable_slot() in drivers/pci/hotplug/acpiphp_glue.c, if pci_get_slot()
will return NULL, we will do not set SLOT_ENABLED flag of slot. if one
device is found by calling pci_get_slot(), its reference count will be
increased. In this case, we did not call pci_dev_put() to decrement the
its reference count, the memory of the device (struct pci_dev type) will
leak.

Fix it by calling pci_dev_put() to decrement its reference count after that
pci_get_slot() returns a PCI device.

Signed-off-by: Feilong Lin <linfeilong@...wei.com>
Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
--
v2: rewrite subject and commit log as suggested by Bjorn Helgaas.
---
 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 3365c93abf0e..f031302ad401 100644
--- a/drivers/pci/hotplug/acpiphp_glue.c
+++ b/drivers/pci/hotplug/acpiphp_glue.c
@@ -533,6 +533,7 @@ static void enable_slot(struct acpiphp_slot *slot, bool bridge)
 			slot->flags &= ~SLOT_ENABLED;
 			continue;
 		}
+		pci_dev_put(dev);
 	}
 }

-- 
2.19.1