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ACPICA: Avoid walking the ACPI Namespace if it is not there

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[ Upstream commit 0c9992315e ]

ACPICA commit b1c3656ef4950098e530be68d4b589584f06cddc

Prevent acpi_ns_walk_namespace() from crashing when called with
start_node equal to ACPI_ROOT_OBJECT if the Namespace has not been
instantiated yet and acpi_gbl_root_node is NULL.

For instance, this can happen if the kernel is run with "acpi=off"
in the command line.

Link: b1c3656ef4
Link: https://lore.kernel.org/linux-acpi/CAJZ5v0hJWW_vZ3wwajE7xT38aWjY7cZyvqMJpXHzUL98-SiCVQ@mail.gmail.com/
Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Rafael J. Wysocki 2022-03-07 20:28:26 +01:00 committed by Greg Kroah-Hartman
parent f7790ed2e6
commit 9e496fc395
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/acpica/nswalk.c
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@ -203,6 +203,9 @@ acpi_ns_walk_namespace(acpi_object_type type,
if (start_node == ACPI_ROOT_OBJECT) {
start_node = acpi_gbl_root_node;
if (!start_node) {
return_ACPI_STATUS(AE_NO_NAMESPACE);
}
}
/* Null child means "get first node" */