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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-03-07 20:28:26 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-03-07 20:28:26 +0100 |
| commit | 0c9992315e738e7d6e927ef36839a466b080dba6 (patch) | |
| tree | 504b476500a50c83b76226a010e2ec4d219c72f2 | |
| parent | ae57857b9b6341096ddfd9c0cf26fb640c561160 (diff) | |
| download | linux-0c9992315e738e7d6e927ef36839a466b080dba6.tar.gz | |
ACPICA: Avoid walking the ACPI Namespace if it is not there
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: https://github.com/acpica/acpica/commit/b1c3656ef4950098e530be68d4b589584f06cddc
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>
| -rw-r--r-- | drivers/acpi/acpica/nswalk.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/nswalk.c b/drivers/acpi/acpica/nswalk.c index 915c2433463d..e7c30ce06e18 100644 --- a/drivers/acpi/acpica/nswalk.c +++ b/drivers/acpi/acpica/nswalk.c @@ -169,6 +169,9 @@ 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" */ |