[PATCH 5.10 513/717] vfio/pci: Move dummy_resources_list init in vfio_pci_probe()

[Greg Kroah-Hartman]

From: Eric Auger <eric.au...@redhat.com>

commit 16b8fe4caf499ae8e12d2ab1b1324497e36a7b83 upstream.

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.au...@redhat.com>
Fixes: 05f0c03fbac1 ("vfio-pci: Allow to mmap sub-page MMIO BARs if the mmio 
page is exclusive")
CC: Stable <sta...@vger.kernel.org> # v4.7+
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/vfio/pci/vfio_pci.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -161,8 +161,6 @@ static void vfio_pci_probe_mmaps(struct
        int i;
        struct vfio_pci_dummy_resource *dummy_res;
 
-       INIT_LIST_HEAD(&vdev->dummy_resources_list);
-
        for (i = 0; i < PCI_STD_NUM_BARS; i++) {
                int bar = i + PCI_STD_RESOURCES;
 
@@ -1966,6 +1964,7 @@ static int vfio_pci_probe(struct pci_dev
        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);