* [PATCH] PCIE/PME: fix possible use-after-free on remove
@ 2019-02-18 19:57 Sven Van Asbroeck
2019-02-25 14:57 ` Mika Westerberg
0 siblings, 1 reply; 2+ messages in thread
From: Sven Van Asbroeck @ 2019-02-18 19:57 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: linux-pci, linux-kernel, Sinan Kaya, Frederick Lawler,
Mika Westerberg, Keith Busch
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@kernel.org>
Cc: Frederick Lawler <fred@fredlawl.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
---
drivers/pci/pcie/pme.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/pcie/pme.c b/drivers/pci/pcie/pme.c
index 0dbcf429089f..87823f669ccc 100644
--- a/drivers/pci/pcie/pme.c
+++ b/drivers/pci/pcie/pme.c
@@ -427,9 +427,12 @@ static int pcie_pme_resume(struct pcie_device *srv)
*/
static void pcie_pme_remove(struct pcie_device *srv)
{
+ struct pcie_pme_service_data *data = get_service_data(srv);
+
pcie_pme_suspend(srv);
free_irq(srv->irq, srv);
- kfree(get_service_data(srv));
+ cancel_work_sync(&data->work);
+ kfree(data);
}
static int pcie_pme_runtime_suspend(struct pcie_device *srv)
--
2.17.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] PCIE/PME: fix possible use-after-free on remove
2019-02-18 19:57 [PATCH] PCIE/PME: fix possible use-after-free on remove Sven Van Asbroeck
@ 2019-02-25 14:57 ` Mika Westerberg
0 siblings, 0 replies; 2+ messages in thread
From: Mika Westerberg @ 2019-02-25 14:57 UTC (permalink / raw)
To: Sven Van Asbroeck
Cc: Bjorn Helgaas, linux-pci, linux-kernel, Sinan Kaya,
Frederick Lawler, Keith Busch
On Mon, Feb 18, 2019 at 02:57:30PM -0500, Sven Van Asbroeck wrote:
> 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@kernel.org>
> Cc: Frederick Lawler <fred@fredlawl.com>
> Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
^ permalink raw reply [flat|nested] 2+ messages in thread
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