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| author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-01-27 20:33:33 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2022-01-27 20:33:33 +0100 |
| commit | b1c3656ef4950098e530be68d4b589584f06cddc (patch) | |
| tree | 56125dc5762d7537590e8230dc21c72c6529bf89 | |
| parent | b32dde35e26a63a85d78d4dc0a7260b61e626ac1 (diff) | |
| download | acpica-b1c3656ef4950098e530be68d4b589584f06cddc.tar.gz | |
Namespace: Avoid walking the Namespace if it is not there
Prevent AcpiNsWalkNamespace () from crashing when called with
StartNode equal to ACPI_ROOT_OBJECT if the Namespace has not
been instantiated yet and AcpiGbl_RootNode is NULL.
For instance, this can happen in the Linux kernel if it is run
with "acpi=off" in the command line.
Reported-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/linux-acpi/6a0233cd-d931-8a36-3b9e-08b774cec7b0@redhat.com/
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
| -rw-r--r-- | source/components/namespace/nswalk.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/source/components/namespace/nswalk.c b/source/components/namespace/nswalk.c index 50c5ed5ba..b1e114490 100644 --- a/source/components/namespace/nswalk.c +++ b/source/components/namespace/nswalk.c @@ -322,6 +322,10 @@ AcpiNsWalkNamespace ( if (StartNode == ACPI_ROOT_OBJECT) { StartNode = AcpiGbl_RootNode; + if (!StartNode) + { + return_ACPI_STATUS (AE_NO_NAMESPACE); + } } /* Null child means "get first node" */ |