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Message-ID: <20230816204143.66281-5-mario.limonciello@amd.com>
Date: Wed, 16 Aug 2023 15:41:38 -0500
From: Mario Limonciello <mario.limonciello@....com>
To: "Rafael J . Wysocki" <rafael@...nel.org>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Bjorn Helgaas <helgaas@...nel.org>
CC: <linux-pci@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Andy Shevchenko" <andriy.shevchenko@...ux.intel.com>,
<linux-acpi@...r.kernel.org>,
Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com>,
"Iain Lane" <iain@...ngesquash.org.uk>,
Shyam-sundar S-k <Shyam-sundar.S-k@....com>,
Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v12 4/9] 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@...nel.org>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
---
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 7711dde68947f..508decbac2986 100644
--- a/drivers/acpi/x86/s2idle.c
+++ b/drivers/acpi/x86/s2idle.c
@@ -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);
--
2.34.1
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