[PATCH 5.15 012/110] ACPI: x86: s2idle: Catch multiple ACPI_TYPE_PACKAGE objects

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5.15-stable review patch.  If anyone has any objections, please let me know.


From: Mario Limonciello <mario.limonciello@xxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
 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 946e0160ad3bf..ada989670d9b8 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,

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