This is a note to let you know that I've just added the patch titled
firmware: dmi_scan: Only honor end-of-table for 64-bit tables
to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
firmware-dmi_scan-only-honor-end-of-table-for-64-bit-tables.patch
and it can be found in the queue-4.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 17cd5bd5391e6e7b363d66335e1bc6760ae969b9 Mon Sep 17 00:00:00 2001
From: Jean Delvare <jdelvare@xxxxxxx>
Date: Thu, 25 Jun 2015 09:06:55 +0200
Subject: firmware: dmi_scan: Only honor end-of-table for 64-bit tables
From: Jean Delvare <jdelvare@xxxxxxx>
commit 17cd5bd5391e6e7b363d66335e1bc6760ae969b9 upstream.
A 32-bit entry point to a DMI table says how many structures the table
contains. The SMBIOS specification explicitly says that end-of-table
markers should be ignored if they are not actually at the end of the
DMI table. So only honor the end-of-table marker for tables accessed
through 64-bit entry points, as they do not specify a structure count.
Fixes: fc43026278 ("dmi: add support for SMBIOS 3.0 64-bit entry point")
Signed-off-by: Jean Delvare <jdelvare@xxxxxxx>
Acked-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
Cc: Leif Lindholm <leif.lindholm@xxxxxxxxxx>
Cc: Matt Fleming <matt.fleming@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/dmi_scan.c | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)
--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -89,9 +89,9 @@ static void dmi_table(u8 *buf,
/*
* Stop when we have seen all the items the table claimed to have
- * (SMBIOS < 3.0 only) OR we reach an end-of-table marker OR we run
- * off the end of the table (should never happen but sometimes does
- * on bogus implementations.)
+ * (SMBIOS < 3.0 only) OR we reach an end-of-table marker (SMBIOS
+ * >= 3.0 only) OR we run off the end of the table (should never
+ * happen but sometimes does on bogus implementations.)
*/
while ((!dmi_num || i < dmi_num) &&
(data - buf + sizeof(struct dmi_header)) <= dmi_len) {
@@ -110,8 +110,13 @@ static void dmi_table(u8 *buf,
/*
* 7.45 End-of-Table (Type 127) [SMBIOS reference spec v3.0.0]
+ * For tables behind a 64-bit entry point, we have no item
+ * count and no exact table length, so stop on end-of-table
+ * marker. For tables behind a 32-bit entry point, we have
+ * seen OEM structures behind the end-of-table marker on
+ * some systems, so don't trust it.
*/
- if (dm->type == DMI_ENTRY_END_OF_TABLE)
+ if (!dmi_num && dm->type == DMI_ENTRY_END_OF_TABLE)
break;
data += 2;
Patches currently in stable-queue which might be from jdelvare@xxxxxxx are
queue-4.1/firmware-dmi_scan-only-honor-end-of-table-for-64-bit-tables.patch
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