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Troy Moure 412af97838 ACPI: video: prevent NULL deref in acpi_get_pci_dev() 
ref: http://thread.gmane.org/gmane.linux.kernel/857228/focus=857468

When the ACPI video driver initializes, it does a namespace walk
looking for for supported devices. When we find an appropriate
handle, we walk up the ACPI tree looking for a PCI root bus, and
then walk back down the PCI bus, assuming that every device
inbetween is a P2P bridge.

This assumption is not correct, and is reported broken on at
least:

	Dell Latitude E6400
	ThinkPad X61
	Dell XPS M1330

Add a NULL deref check to prevent boot panics.

Reported-by: Alessandro Suardi <alessandro.suardi@gmail.com>
Signed-off-by: Troy Moure <twmoure@szypr.net>
Signed-off-by: Alex Chiang <achiang@hp.com>
Signed-off-by: Len Brown <len.brown@intel.com>
 		2009-06-26 00:23:42 -04:00
..
acpica
…
Kconfig PCI: drivers/pci/slot.c should depend on CONFIG_SYSFS 2009-06-18 13:57:24 -07:00
Makefile
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ac.c ACPI: ac: use .notify method instead of installing handler directly 2009-06-18 00:13:14 -04:00
acpi_memhotplug.c
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battery.c ACPI: battery: fix CONFIG_ACPI_PROCFS_POWER=n build warning 2009-06-18 00:38:27 -04:00
blacklist.c ACPI: DMI to disable Vista compatibility on some Sony laptops 2009-06-23 23:32:47 -04:00
bus.c ACPI: use handle, not device, in system notification path 2009-06-18 00:13:15 -04:00
button.c
…
cm_sbs.c
…
container.c
…
debug.c
…
dock.c
…
ec.c
…
event.c
…
fan.c
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glue.c ACPI: kill acpi_get_physical_pci_device() 2009-06-17 23:32:24 -04:00
internal.h
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numa.c
…
osl.c ACPI: fix a deadlock in hotplug case 2009-06-23 23:23:14 -04:00
pci_bind.c ACPI: kill acpi_get_pci_id 2009-06-17 23:32:23 -04:00
pci_irq.c Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release 2009-06-24 01:19:50 -04:00
pci_link.c
…
pci_root.c ACPI: video: prevent NULL deref in acpi_get_pci_dev() 2009-06-26 00:23:42 -04:00
pci_slot.c
…
power.c
…
proc.c
…
processor_core.c Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release 2009-06-24 01:19:50 -04:00
processor_idle.c Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release 2009-06-24 01:19:50 -04:00
processor_perflib.c
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processor_thermal.c
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processor_throttling.c
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reboot.c
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sbs.c
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sbshc.c
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sbshc.h
…
scan.c Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release 2009-06-24 01:19:50 -04:00
sleep.c
…
sleep.h
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system.c
…
tables.c
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thermal.c
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utils.c
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video.c Merge branches 'acerhdf', 'acpi-pci-bind', 'bjorn-pci-root', 'bugzilla-12904', 'bugzilla-13121', 'bugzilla-13396', 'bugzilla-13533', 'bugzilla-13612', 'c3_lock', 'hid-cleanups', 'misc-2.6.31', 'pdc-leak-fix', 'pnpacpi', 'power_nocheck', 'thinkpad_acpi', 'video' and 'wmi' into release 2009-06-24 01:19:50 -04:00
video_detect.c ACPI: video: convert to acpi_get_pci_dev 2009-06-17 23:32:23 -04:00
wakeup.c
…