[PATCH] vfio/pci: Add missing range check in vfio_pci_mmap

[Christian A. Ehrhardt]

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>
---
 drivers/vfio/pci/vfio_pci.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 65e7e6b44578..5023e23db3bc 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1656,6 +1656,8 @@ static int vfio_pci_mmap(void *device_data, struct 
vm_area_struct *vma)
 
        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)
@@ -1664,7 +1666,7 @@ static int vfio_pci_mmap(void *device_data, struct 
vm_area_struct *vma)
                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;
-- 
2.25.1