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pci: Common overflow prevention

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Introduce pci_config_read/write_common helpers to prevent passing
accesses down the callback chain that go beyond the config space limits.
Adjust length assertions as they are no longer correct (cutting may
generate valid 3 byte accesses).

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jan Kiszka 2011-07-22 11:05:01 +02:00 • committed by Michael S. Tsirkin
parent 85dde9a90b
commit 42e4126b79
4 changed files with 34 additions and 14 deletions
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6
hw/pci_host.h
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@ -39,6 +39,12 @@ struct PCIHostState {
PCIBus *bus;
};
/* common internal helpers for PCI/PCIe hosts, cut off overflows */
void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
uint32_t limit, uint32_t val, uint32_t len);
uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
uint32_t limit, uint32_t len);
void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, int len);
uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len);