This is a note to let you know that I've just added the patch titled
vfio/pci: Clear error and request eventfd ctx after releasing
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vfio-pci-clear-error-and-request-eventfd-ctx-after-r.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6f3828b939cb1039bd265146e240ee6af51d74b3
Author: Alex Williamson <alex.williamson@xxxxxxxxxx>
Date: Tue Jun 16 15:26:36 2020 -0600
vfio/pci: Clear error and request eventfd ctx after releasing
[ Upstream commit 5c5866c593bbd444d0339ede6a8fb5f14ff66d72 ]
The next use of the device will generate an underflow from the
stale reference.
Cc: Qian Cai <cai@xxxxxx>
Fixes: 1518ac272e78 ("vfio/pci: fix memory leaks of eventfd ctx")
Reported-by: Daniel Wagner <dwagner@xxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
Tested-by: Daniel Wagner <dwagner@xxxxxxx>
Signed-off-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 86cd8bdfa9f28..94fad366312f1 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -409,10 +409,14 @@ static void vfio_pci_release(void *device_data)
if (!(--vdev->refcnt)) {
vfio_spapr_pci_eeh_release(vdev->pdev);
vfio_pci_disable(vdev);
- if (vdev->err_trigger)
+ if (vdev->err_trigger) {
eventfd_ctx_put(vdev->err_trigger);
- if (vdev->req_trigger)
+ vdev->err_trigger = NULL;
+ }
+ if (vdev->req_trigger) {
eventfd_ctx_put(vdev->req_trigger);
+ vdev->req_trigger = NULL;
+ }
}
mutex_unlock(&driver_lock);
