From: Rafael J. Wysocki Date: Mon, 7 Mar 2022 19:28:26 +0000 (+0100) Subject: ACPICA: Avoid walking the ACPI Namespace if it is not there X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0c9992315e738e7d6e927ef36839a466b080dba6;p=linux.git 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 Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/acpi/acpica/nswalk.c b/drivers/acpi/acpica/nswalk.c index 915c2433463d7..e7c30ce06e189 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" */