From: Mario Limonciello mario.limonciello@amd.com
[ Upstream commit 883cf0d4cf288313b71146ddebdf5d647b76c78b ]
If a badly constructed firmware includes multiple `ACPI_TYPE_PACKAGE` objects while evaluating the AMD LPS0 _DSM, there will be a memory leak. Explicitly guard against this.
Suggested-by: Bjorn Helgaas helgaas@kernel.org Signed-off-by: Mario Limonciello mario.limonciello@amd.com Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/acpi/x86/s2idle.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/acpi/x86/s2idle.c b/drivers/acpi/x86/s2idle.c index 4a11a38764321..3d6105ec2de1f 100644 --- a/drivers/acpi/x86/s2idle.c +++ b/drivers/acpi/x86/s2idle.c @@ -111,6 +111,12 @@ static void lpi_device_get_constraints_amd(void) union acpi_object *package = &out_obj->package.elements[i];
if (package->type == ACPI_TYPE_PACKAGE) { + if (lpi_constraints_table) { + acpi_handle_err(lps0_device_handle, + "Duplicate constraints list\n"); + goto free_acpi_buffer; + } + lpi_constraints_table = kcalloc(package->package.count, sizeof(*lpi_constraints_table), GFP_KERNEL);