linux-kernel - [PATCH v2 vfio 1/2] vfio/pds: Always clear the save/restore FDs on reset

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Message-ID: <20240228003205.47311-2-brett.creeley@amd.com>
Date: Tue, 27 Feb 2024 16:32:04 -0800
From: Brett Creeley <brett.creeley@....com>
To: <jgg@...pe.ca>, <yishaih@...dia.com>,
	<shameerali.kolothum.thodi@...wei.com>, <kevin.tian@...el.com>,
	<alex.williamson@...hat.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: <shannon.nelson@....com>, <brett.creeley@....com>,
	<stable@...r.kernel.org>
Subject: [PATCH v2 vfio 1/2] vfio/pds: Always clear the save/restore FDs on reset

After reset the VFIO device state will always be put in
VFIO_DEVICE_STATE_RUNNING, but the save/restore files will only be
cleared if the previous state was VFIO_DEVICE_STATE_ERROR. This
can/will cause the restore/save files to be leaked if/when the
migration state machine transitions through the states that
re-allocates these files. Fix this by always clearing the
restore/save files for resets.

Fixes: 7dabb1bcd177 ("vfio/pds: Add support for firmware recovery")
Cc: stable@...r.kernel.org
Signed-off-by: Brett Creeley <brett.creeley@....com>
Reviewed-by: Shannon Nelson <shannon.nelson@....com>
---
 drivers/vfio/pci/pds/vfio_dev.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/pci/pds/vfio_dev.c b/drivers/vfio/pci/pds/vfio_dev.c
index 4c351c59d05a..a286ebcc7112 100644
--- a/drivers/vfio/pci/pds/vfio_dev.c
+++ b/drivers/vfio/pci/pds/vfio_dev.c
@@ -32,9 +32,9 @@ void pds_vfio_state_mutex_unlock(struct pds_vfio_pci_device *pds_vfio)
 	mutex_lock(&pds_vfio->reset_mutex);
 	if (pds_vfio->deferred_reset) {
 		pds_vfio->deferred_reset = false;
+		pds_vfio_put_restore_file(pds_vfio);
+		pds_vfio_put_save_file(pds_vfio);
 		if (pds_vfio->state == VFIO_DEVICE_STATE_ERROR) {
-			pds_vfio_put_restore_file(pds_vfio);
-			pds_vfio_put_save_file(pds_vfio);
 			pds_vfio_dirty_disable(pds_vfio, false);
 		}
 		pds_vfio->state = pds_vfio->deferred_reset_state;
-- 
2.17.1