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| author | Alex James <theracermaster@gmail.com> | 2017-07-10 15:24:02 +0800 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-07-20 16:38:26 +0200 |
| commit | 4e6cbe5689a5af8435bebc57b77d7dd4420b4134 (patch) | |
| tree | 8a34c0eba53caedc961f1c13ae51c8c7ce9a6291 /drivers | |
| parent | 19df56bdf0833a8ad9dfe056931696b9e0e30463 (diff) | |
| download | linux-4e6cbe5689a5af8435bebc57b77d7dd4420b4134.tar.bz2 | |
ACPICA: iASL: Ensure that the target node is valid in acpi_ex_create_alias
ACPICA commit 8b14afac65d983610cc5387ede6d85ea5ee075be
The following ACPI table contains an invalid target node within the
Alias operator:
definition_block ("", "SSDT", 1, "Bug", "BugTable", 0x00001000)
{
Scope (_SB)
{
Device (DEV0)
{
Name (_ADR, 1)
Device (DEV1)
{
Alias (_ADR, _ADR)
}
}
}
}
If an ACPI table contains such an invalid target node in an Alias
operator, a segmentation fault will occur when the target node is
dereferenced within acpi_ex_create_alias. Add a check for such an invalid
target node in acpi_ex_create_alias and return AE_NULL_OBJECT as suggested
by @acpibob.
Link: https://github.com/acpica/acpica/commit/8b14afac
Signed-off-by: Alex James <theracermaster@gmail.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/acpi/acpica/excreate.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/excreate.c b/drivers/acpi/acpica/excreate.c index d43d7da4c734..68675868e20f 100644 --- a/drivers/acpi/acpica/excreate.c +++ b/drivers/acpi/acpica/excreate.c @@ -87,6 +87,11 @@ acpi_status acpi_ex_create_alias(struct acpi_walk_state *walk_state) target_node->object); } + /* Ensure that the target node is valid */ + if (!target_node) { + return_ACPI_STATUS(AE_NULL_OBJECT); + } + /* * For objects that can never change (i.e., the NS node will * permanently point to the same object), we can simply attach |