linux-kernel - [PATCH] ACPI: MRRM: Check revision of MRRM table

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Message-ID: <20251022204523.10752-1-tony.luck@intel.com>
Date: Wed, 22 Oct 2025 13:45:23 -0700
From: Tony Luck <tony.luck@...el.com>
To: "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Cc: linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	patches@...ts.linux.dev,
	Tony Luck <tony.luck@...el.com>
Subject: [PATCH] ACPI: MRRM: Check revision of MRRM table

Before trying to parse the MRRM table, check that the table revision
is the one that is expected.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---
 drivers/acpi/acpi_mrrm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/acpi/acpi_mrrm.c b/drivers/acpi/acpi_mrrm.c
index 47ea3ccc2142..a6dbf623e557 100644
--- a/drivers/acpi/acpi_mrrm.c
+++ b/drivers/acpi/acpi_mrrm.c
@@ -63,6 +63,9 @@ static __init int acpi_parse_mrrm(struct acpi_table_header *table)
 	if (!mrrm)
 		return -ENODEV;
 
+	if (mrrm->header.revision != 1)
+		return -EINVAL;
+
 	if (mrrm->flags & ACPI_MRRM_FLAGS_REGION_ASSIGNMENT_OS)
 		return -EOPNOTSUPP;
 
-- 
2.51.0