firewire: ohci: sanity-check MMIO resource

pci_request_region() does not fail on resources that have not been
allocated by the BIOS or by the kernel, so to avoid accessing
registers that are not there, we have to check for this explicitly.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index 1c365b82781..922cd26b25e 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -3545,6 +3545,13 @@ static int __devinit pci_probe(struct pci_dev *dev,
 
         INIT_WORK(&ohci->bus_reset_work, bus_reset_work);
 
+        if (!(pci_resource_flags(dev, 0) & IORESOURCE_MEM) ||
+            pci_resource_len(dev, 0) < OHCI1394_REGISTER_SIZE) {
+                dev_err(&dev->dev, "invalid MMIO resource\n");
+                err = -ENXIO;
+                goto fail_disable;
+        }
+
         err = pci_request_region(dev, 0, ohci_driver_name);
         if (err) {
                 dev_err(&dev->dev, "MMIO resource unavailable\n");