[PATCH] pci init: Check if devfn exceeding the max devices number supported on bus

Ken CC
2010-08-23T05:53:20Z

Check before trying subindexing.

Signed-off-by: Ken CC <ken.ccao@gmail.com>
---
hw/pci.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/hw/pci.c b/hw/pci.c
index a09fbac..f6f00c6 100644
--- a/hw/pci.c
+++ b/hw/pci.c
@@ -675,6 +675,10 @@ static PCIDevice *do_pci_register_device(PCIDevice *pci_dev, PCIBus *bus,
error_report("PCI: no slot/function available for %s, all in use", name);
return NULL;
found: ;
+ } else if (devfn > PCIBUS_MAX_DEVICES - 1) {
+ error_report("PCI: devfn is out of bus capacity."
+ " Only %d devices supported.", PCIBUS_MAX_DEVICES);
+ return NULL;
} else if (bus->devices[devfn]) {
error_report("PCI: slot %d function %d not available for %s, in use by %s",
PCI_SLOT(devfn), PCI_FUNC(devfn), name, bus->devices[devfn]->name);