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Message-Id: <20220418121216.265246199@linuxfoundation.org>
Date: Mon, 18 Apr 2022 14:12:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 159/284] ACPICA: Avoid walking the ACPI Namespace if it is not there
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
[ Upstream commit 0c9992315e738e7d6e927ef36839a466b080dba6 ]
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@...hat.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/acpi/acpica/nswalk.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/acpi/acpica/nswalk.c b/drivers/acpi/acpica/nswalk.c
index 6b6e6f498cff..129fc61f14c4 100644
--- a/drivers/acpi/acpica/nswalk.c
+++ b/drivers/acpi/acpica/nswalk.c
@@ -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" */
--
2.34.1
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