[PATCH 02/17] pci: Fix another sanity check bug in /proc/pci mmap

[David Woodhouse]

From: David Woodhouse <d...@amazon.co.uk>

Don't match MMIO maps with I/O BARs and vice versa.

Signed-off-by: David Woodhouse <d...@amazon.co.uk>
Cc: sta...@vger.kernel.org
---
 drivers/pci/proc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index f82710a..62a0c3e 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -231,14 +231,20 @@ static int proc_bus_pci_mmap(struct file *file, struct 
vm_area_struct *vma)
 {
        struct pci_dev *dev = PDE_DATA(file_inode(file));
        struct pci_filp_private *fpriv = file->private_data;
-       int i, ret, write_combine;
+       int i, ret, write_combine, res_bit;
 
        if (!capable(CAP_SYS_RAWIO))
                return -EPERM;
 
+       if (fpriv->mmap_state == pci_mmap_io)
+               res_bit = IORESOURCE_IO;
+       else
+               res_bit = IORESOURCE_MEM;
+
        /* Make sure the caller is mapping a real resource for this device */
        for (i = 0; i < PCI_ROM_RESOURCE; i++) {
-               if (pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
+               if (dev->resource[i].flags & res_bit &&
+                   pci_mmap_fits(dev, i, vma,  PCI_MMAP_PROCFS))
                        break;
        }
 
-- 
2.9.3