[PATCH 4.9 089/105] vfio-pci: Handle error from pci_iomap

[Greg Kroah-Hartman]

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Arvind Yadav <arvind.yadav...@gmail.com>


[ Upstream commit e19f32da5ded958238eac1bbe001192acef191a2 ]

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

Signed-off-by: Arvind Yadav <arvind.yadav...@gmail.com>
Signed-off-by: Alex Williamson <alex.william...@redhat.com>
Signed-off-by: Sasha Levin <alexander.le...@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 drivers/vfio/pci/vfio_pci.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1173,6 +1173,10 @@ static int vfio_pci_mmap(void *device_da
                        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;