From: Christian A. Ehrhardt <l...@c--e.de>

commit 909290786ea335366e21d7f1ed5812b90f2f0a92 upstream.

When mmaping an extra device region verify that the region index
derived from the mmap offset is valid.

Fixes: a15b1883fee1 ("vfio_pci: Allow mapping extra regions")
Cc: sta...@vger.kernel.org
Signed-off-by: Christian A. Ehrhardt <l...@c--e.de>
Message-Id: <20210412214124.ga241...@lisa.in-ulm.de>
Reviewed-by: David Gibson <da...@gibson.dropbear.id.au>
Reviewed-by: Cornelia Huck <coh...@redhat.com>
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/vfio/pci/vfio_pci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1658,6 +1658,8 @@ static int vfio_pci_mmap(void *device_da
 
        index = vma->vm_pgoff >> (VFIO_PCI_OFFSET_SHIFT - PAGE_SHIFT);
 
+       if (index >= VFIO_PCI_NUM_REGIONS + vdev->num_regions)
+               return -EINVAL;
        if (vma->vm_end < vma->vm_start)
                return -EINVAL;
        if ((vma->vm_flags & VM_SHARED) == 0)
@@ -1666,7 +1668,7 @@ static int vfio_pci_mmap(void *device_da
                int regnum = index - VFIO_PCI_NUM_REGIONS;
                struct vfio_pci_region *region = vdev->region + regnum;
 
-               if (region && region->ops && region->ops->mmap &&
+               if (region->ops && region->ops->mmap &&
                    (region->flags & VFIO_REGION_INFO_FLAG_MMAP))
                        return region->ops->mmap(vdev, region, vma);
                return -EINVAL;


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