From: Tony Luck <tony.luck@intel.com>
Date: Wed, 22 Oct 2025 20:45:23 +0000 (-0700)
Subject: ACPI: MRRM: Check revision of MRRM table
X-Git-Tag: v6.18-rc4~21^2~2
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=dc131bcd8d9219f7da533918abcb0d32951b7702;p=thirdparty%2Fkernel%2Fstable.git

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.

Fixes: b9020bdb9f76 ("ACPI: MRRM: Minimal parse of ACPI MRRM table")
Signed-off-by: Tony Luck <tony.luck@intel.com>
Link: https://patch.msgid.link/20251022204523.10752-1-tony.luck@intel.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

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;