PCI: check mmap range of /proc/bus/pci files too
/proc/bus/pci allows you to mmap resource ranges too, so we should probably be
checking to make sure the mapping is somewhat valid. Uses the same code as the recent sysfs mmap range checking patch from Linus.
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index e1098c3..7fb086d 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -252,11 +252,20 @@
const struct proc_dir_entry *dp = PDE(inode);
struct pci_dev *dev = dp->data;
struct pci_filp_private *fpriv = file->private_data;
- int ret;
+ int i, ret;
if (!capable(CAP_SYS_RAWIO))
return -EPERM;
+ /* 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))
+ break;
+ }
+
+ if (i >= PCI_ROM_RESOURCE)
+ return -ENODEV;
+
ret = pci_mmap_page_range(dev, vma,
fpriv->mmap_state,
fpriv->write_combine);
