[PATCH AUTOSEL 6.4 12/13] ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects

Sasha Levin
2023-09-08T18:02:42Z

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 e499c60c45791..2e0778ddd0ad8 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -112,6 +112,12 @@ 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);
--
2.40.1