vfio-pci: Handle error from pci_iomap

Here, pci_iomap can fail, handle this case release selected
pci regions and return -ENOMEM.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index dcd7c2a99618..324c52e3a1a4 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1142,6 +1142,10 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
                         return ret;
 
                 vdev->barmap[index] = pci_iomap(pdev, index, 0);
+                if (!vdev->barmap[index]) {
+                        pci_release_selected_regions(pdev, 1 << index);
+                        return -ENOMEM;
+                }
         }
 
         vma->vm_private_data = vdev;