linux-kernel - [PATCH AUTOSEL 4.19 047/100] PCI/PME: Fix possible use-after-free on remove

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Message-Id: <20191018220525.9042-47-sashal@kernel.org>
Date:   Fri, 18 Oct 2019 18:04:32 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sven Van Asbroeck <thesven73@...il.com>,
        Sven Van Asbroeck <TheSven73@...il.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        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>,
        Sasha Levin <sashal@...nel.org>, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 047/100] PCI/PME: Fix possible use-after-free on remove

From: Sven Van Asbroeck <thesven73@...il.com>

[ Upstream commit 7cf58b79b3072029af127ae865ffc6f00f34b1f8 ]

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.

Signed-off-by: Sven Van Asbroeck <TheSven73@...il.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@...gle.com>
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: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/pcie/pme.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index e85c5a8206c43..6ac17f0c40775 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);
 }
 
-- 
2.20.1