linux-kernel - [PATCH AUTOSEL 4.9 1/6] firmware: dmi: Use the proper accessor for the version field

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Message-Id: <20220830172706.582088-1-sashal@kernel.org>
Date:   Tue, 30 Aug 2022 13:27:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jean Delvare <jdelvare@...e.de>,
        Sasha Levin <sashal@...nel.org>, jdelvare@...e.com
Subject: [PATCH AUTOSEL 4.9 1/6] firmware: dmi: Use the proper accessor for the version field

From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

[ Upstream commit d2139dfca361a1f5bfc4d4a23455b1a409a69cd4 ]

The byte at offset 6 represents length. Don't take it and drop it
immediately by using proper accessor, i.e. get_unaligned_be24().

[JD: Change the subject to something less frightening]

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Jean Delvare <jdelvare@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/firmware/dmi_scan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
index 42844c318445e..1727d7eaf2413 100644
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -572,7 +572,7 @@ static int __init dmi_smbios3_present(const u8 *buf)
 {
 	if (memcmp(buf, "_SM3_", 5) == 0 &&
 	    buf[6] < 32 && dmi_checksum(buf, buf[6])) {
-		dmi_ver = get_unaligned_be32(buf + 6) & 0xFFFFFF;
+		dmi_ver = get_unaligned_be24(buf + 7);
 		dmi_num = 0;			/* No longer specified */
 		dmi_len = get_unaligned_le32(buf + 12);
 		dmi_base = get_unaligned_le64(buf + 16);
-- 
2.35.1