linux-kernel - [PATCH v2] PCIE/PME: fix possible use-after-free on remove

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Date:   Fri,  1 Mar 2019 11:54:19 -0500
From:   Sven Van Asbroeck <thesven73@...il.com>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Sinan Kaya <okaya@...nel.org>,
        Frederick Lawler <fred@...dlawl.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Keith Busch <keith.busch@...el.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH v2] PCIE/PME: fix possible use-after-free on remove

In remove(), ensure that the pme work cannot run after kfree()
is called. Otherwise, this could result in a use-after-free.

This issue was detected with the help of Coccinelle.

Cc: Sinan Kaya <okaya@...nel.org>
Cc: Frederick Lawler <fred@...dlawl.com>
Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc: Keith Busch <keith.busch@...el.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
---
 drivers/pci/pcie/pme.c | 1 +
 1 file changed, 1 insertion(+)

v2:
	rebased against Bjorn Helgaas's pcm/pm branch at
	git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git

diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index efa5b552914b..54d593d10396 100644
--- a/drivers/pci/pcie/pme.c
+++ b/drivers/pci/pcie/pme.c
@@ -437,6 +437,7 @@ static void pcie_pme_remove(struct pcie_device *srv)
 
 	pcie_pme_disable_interrupt(srv->port, data);
 	free_irq(srv->irq, srv);
+	cancel_work_sync(&data->work);
 	kfree(data);
 }
 
-- 
2.17.1