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Detect invalid PCI devices more correctly in PCI interrupt router drivers.

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- Check for an invalid device (vendor is invalid) before reading the
  header type register when examining function 0 of a possible device.
- When iterating over functions of a device, reject any device whose
  16-bit vendor is invalid rather than requiring the full 32-bit
  vendor+device to be all 1's.  In practice the latter check is
  probably fine, but checking the vendor is what the PCI spec
  recommends.

Reviewed by:	imp
MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D21147
This commit is contained in:
John Baldwin 2019-08-06 23:15:04 +00:00
parent eda1b01647
commit a04725cd5c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=350662
2 changed files with 12 additions and 6 deletions
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7
sys/dev/acpica/acpi_pci_link.c
View File

@ -580,6 +580,9 @@ acpi_pci_link_search_irq(int bus, int device, int pin)
uint8_t func, maxfunc;
/* See if we have a valid device at function 0. */
value = pci_cfgregread(bus, device, 0, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
return (PCI_INVALID_IRQ);
value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
return (PCI_INVALID_IRQ);
@ -590,8 +593,8 @@ acpi_pci_link_search_irq(int bus, int device, int pin)
/* Scan all possible functions at this device. */
for (func = 0; func <= maxfunc; func++) {
value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
if (value == 0xffffffff)
value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);

11
sys/i386/pci/pci_pir.c
View File

@ -257,8 +257,8 @@ pci_pir_create_links(struct PIR_entry *entry, struct PIR_intpin *intpin,
}
/*
* Look to see if any of the function on the PCI device at bus/device have
* an interrupt routed to intpin 'pin' by the BIOS.
* Look to see if any of the functions on the PCI device at bus/device
* have an interrupt routed to intpin 'pin' by the BIOS.
*/
static uint8_t
pci_pir_search_irq(int bus, int device, int pin)
@ -267,6 +267,9 @@ pci_pir_search_irq(int bus, int device, int pin)
uint8_t func, maxfunc;
/* See if we have a valid device at function 0. */
value = pci_cfgregread(bus, device, 0, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
return (PCI_INVALID_IRQ);
value = pci_cfgregread(bus, device, 0, PCIR_HDRTYPE, 1);
if ((value & PCIM_HDRTYPE) > PCI_MAXHDRTYPE)
return (PCI_INVALID_IRQ);
@ -277,8 +280,8 @@ pci_pir_search_irq(int bus, int device, int pin)
/* Scan all possible functions at this device. */
for (func = 0; func <= maxfunc; func++) {
value = pci_cfgregread(bus, device, func, PCIR_DEVVENDOR, 4);
if (value == 0xffffffff)
value = pci_cfgregread(bus, device, func, PCIR_VENDOR, 2);
if (value == PCIV_INVALID)
continue;
value = pci_cfgregread(bus, device, func, PCIR_INTPIN, 1);