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Message-Id: <20210104155706.203265366@linuxfoundation.org>
Date: Mon, 4 Jan 2021 16:57:08 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Eric Auger <eric.auger@...hat.com>,
Alex Williamson <alex.williamson@...hat.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 09/47] vfio/pci: Move dummy_resources_list init in vfio_pci_probe()
From: Eric Auger <eric.auger@...hat.com>
[ Upstream commit 16b8fe4caf499ae8e12d2ab1b1324497e36a7b83 ]
In case an error occurs in vfio_pci_enable() before the call to
vfio_pci_probe_mmaps(), vfio_pci_disable() will try to iterate
on an uninitialized list and cause a kernel panic.
Lets move to the initialization to vfio_pci_probe() to fix the
issue.
Signed-off-by: Eric Auger <eric.auger@...hat.com>
Fixes: 05f0c03fbac1 ("vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio page is exclusive")
CC: Stable <stable@...r.kernel.org> # v4.7+
Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/vfio/pci/vfio_pci.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 632653cd70e3b..2372e161cd5e8 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -114,8 +114,6 @@ static void vfio_pci_probe_mmaps(struct vfio_pci_device *vdev)
int bar;
struct vfio_pci_dummy_resource *dummy_res;
- INIT_LIST_HEAD(&vdev->dummy_resources_list);
-
for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
res = vdev->pdev->resource + bar;
@@ -1606,6 +1604,7 @@ static int vfio_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
mutex_init(&vdev->igate);
spin_lock_init(&vdev->irqlock);
mutex_init(&vdev->ioeventfds_lock);
+ INIT_LIST_HEAD(&vdev->dummy_resources_list);
INIT_LIST_HEAD(&vdev->ioeventfds_list);
mutex_init(&vdev->vma_lock);
INIT_LIST_HEAD(&vdev->vma_list);
--
2.27.0
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