linux-kernel - [PATCH 3.2 068/221] firmware: dmi_scan: Fix dmi

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Date:	Tue, 05 May 2015 02:16:39 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Ivan Khoronzhuk" <ivan.khoronzhuk@...aro.org>,
	"Ard Biesheuvel" <ard@...aro.org>,
	"Matt Fleming" <matt.fleming@...el.com>
Subject: [PATCH 3.2 068/221] firmware: dmi_scan: Fix dmi_len type

3.2.69-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>

commit 6d9ff473317245e3e5cd9922b4520411c2296388 upstream.

According to SMBIOSv3 specification the length of DMI table can be
up to 32bits wide. So use appropriate type to avoid overflow.

It's obvious that dmi_num theoretically can be more than u16 also,
so it's can be changed to u32 or at least it's better to use int
instead of u16, but on that moment I cannot imagine dmi structure
count more than 65535 and it can require changing type of vars that
work with it. So I didn't correct it.

Acked-by: Ard Biesheuvel <ard@...aro.org>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>
Signed-off-by: Matt Fleming <matt.fleming@...el.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/firmware/dmi_scan.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/firmware/dmi_scan.c
+++ b/drivers/firmware/dmi_scan.c
@@ -69,7 +69,7 @@ static char * __init dmi_string(const st
  *	We have to be cautious here. We have seen BIOSes with DMI pointers
  *	pointing to completely the wrong place for example
  */
-static void dmi_table(u8 *buf, int len, int num,
+static void dmi_table(u8 *buf, u32 len, int num,
 		      void (*decode)(const struct dmi_header *, void *),
 		      void *private_data)
 {
@@ -99,7 +99,7 @@ static void dmi_table(u8 *buf, int len,
 }
 
 static u32 dmi_base;
-static u16 dmi_len;
+static u32 dmi_len;
 static u16 dmi_num;
 
 static int __init dmi_walk_early(void (*decode)(const struct dmi_header *,

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