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linux/drivers/acpi
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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 ACPICA: Disable preservation of SCI enable bit (SCI_EN) 2009-05-27 00:41:34 -04:00
ac.c ACPI: ac: use .notify method instead of installing handler directly 2009-06-18 00:13:14 -04:00
acpi_memhotplug.c trivial: Fix misspelling of "firmware" in acpi_memhotplug.c 2009-01-06 11:28:08 +01:00
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 ACPI: button: remove control method/fixed hardware distinctions 2009-04-11 00:36:41 -04:00
cm_sbs.c ACPI: remove private acpica headers from driver files 2008-12-31 01:15:22 -05:00
container.c ACPI: add missing KERN_* constants to printks 2009-02-07 00:29:32 -05:00
debug.c Merge branch 'acpi-modparam' into release 2009-04-05 01:45:50 -04:00
dock.c Merge branch 'linus' into release 2009-04-05 02:14:15 -04:00
ec.c ACPI: EC: Fix ACPI EC resume non-query interrupt message 2009-04-23 23:56:57 -04:00
event.c netlink: change return-value logic of netlink_broadcast() 2009-02-05 23:56:36 -08:00
fan.c Merge branch 'linus' into release 2009-04-05 02:14:15 -04:00
glue.c ACPI: kill acpi_get_physical_pci_device() 2009-06-17 23:32:24 -04:00
internal.h ACPI: call acpi_wakeup_device_init() explicitly rather than as initcall 2009-03-27 12:51:31 -04:00
Kconfig PCI: drivers/pci/slot.c should depend on CONFIG_SYSFS 2009-06-18 13:57:24 -07:00
Makefile Merge branch 'async-battery' into release 2009-04-05 01:48:46 -04:00
numa.c x86, ACPI: add support for x2apic ACPI extensions 2009-04-03 20:08:12 -04:00
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 ACPI: pci_link: simplify list of link devices 2009-03-17 01:53:29 -04:00
pci_root.c ACPI: video: prevent NULL deref in acpi_get_pci_dev() 2009-06-26 00:23:42 -04:00
pci_slot.c PCI: pci_slot: grab refcount on slot's bus 2009-04-06 11:31:14 -07:00
power.c ACPI: don't check power state after _ON/_OFF 2009-05-27 21:45:53 -04:00
proc.c ACPI: convert acpi_device_lock spinlock to mutex 2009-04-07 00:02:40 -04:00
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 ACPI: sanity check _PSS frequency to prevent cpufreq crash 2009-05-29 20:45:58 -04:00
processor_thermal.c Merge branch 'constify' into release 2009-04-05 01:51:16 -04:00
processor_throttling.c ACPI processor: remove spurious newline from warning message 2009-05-29 21:26:26 -04:00
reboot.c ACPI: reboot.c: use new acpi_reset interface 2008-12-31 01:15:00 -05:00
sbs.c Merge branch 'linus' into release 2009-04-05 02:14:15 -04:00
sbshc.c ACPI: remove private acpica headers from driver files 2008-12-31 01:15:22 -05:00
sbshc.h ACPI: SBS: Ignore alarms coming from unknown devices 2007-12-14 15:14:06 -05:00
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 Merge branch 'bugzilla-13041' into release 2009-04-24 01:35:24 -04:00
sleep.h ACPI: convert acpi_device_lock spinlock to mutex 2009-04-07 00:02:40 -04:00
system.c ACPI: add /sys/firmware/acpi/interrupts/sci_not counter 2009-04-21 00:35:47 -04:00
tables.c Merge branch 'linus' into release 2009-04-05 02:14:15 -04:00
thermal.c thermal: Fix polling frequency for systems without passive cooling 2009-04-18 01:05:23 -04:00
utils.c ACPI: scheduling in atomic via acpi_evaluate_integer () 2008-11-26 17:39:06 -05:00
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 ACPI: convert acpi_device_lock spinlock to mutex 2009-04-07 00:02:40 -04:00