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ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects 

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>
This commit is contained in:
Mario Limonciello 2023-08-18 14:40:03 -05:00 committed by Rafael J. Wysocki
parent 3c6b1212d2
commit 883cf0d4cf
1 changed files with 6 additions and 0 deletions
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6
drivers/acpi/x86/s2idle.c
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@ -113,6 +113,12 @@ 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);