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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Sven Van Asbroeck <TheSven73@gmail.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Sinan Kaya <okaya@kernel.org>,
        Frederick Lawler <fred@fredlawl.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Keith Busch <keith.busch@intel.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 055/149] PCI/PME: Fix possible use-after-free on remove
Date:   Mon,  4 Nov 2019 22:44:08 +0100
Message-Id: <20191104212140.134967027@linuxfoundation.org>
In-Reply-To: <20191104212126.090054740@linuxfoundation.org>
References: <20191104212126.090054740@linuxfoundation.org>
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From: Sven Van Asbroeck <thesven73@gmail.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@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sinan Kaya <okaya@kernel.org>
Cc: Frederick Lawler <fred@fredlawl.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.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