From b95936cb9267e4c90a0b92361609ef5fd85a0a5f Mon Sep 17 00:00:00 2001
From: Doug Warzecha <Douglas_Warzecha@dell.com>
Date: Thu, 19 Oct 2006 23:29:09 -0700
Subject: [PATCH] firmware/dcdbas: add size check in smi_data_write

Add a size check in smi_data_write to prevent possible wrapping problems
with large pos values when calling smi_data_buf_realloc on 32-bit.

Signed-off-by: Doug Warzecha <Douglas_Warzecha@dell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 drivers/firmware/dcdbas.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c
index 8bcb58cd4ac..1865b56fb14 100644
--- a/drivers/firmware/dcdbas.c
+++ b/drivers/firmware/dcdbas.c
@@ -8,7 +8,7 @@
  *
  *  See Documentation/dcdbas.txt for more information.
  *
- *  Copyright (C) 1995-2005 Dell Inc.
+ *  Copyright (C) 1995-2006 Dell Inc.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License v2.0 as published by
@@ -40,7 +40,7 @@
 #include "dcdbas.h"
 
 #define DRIVER_NAME		"dcdbas"
-#define DRIVER_VERSION		"5.6.0-2"
+#define DRIVER_VERSION		"5.6.0-3.2"
 #define DRIVER_DESCRIPTION	"Dell Systems Management Base Driver"
 
 static struct platform_device *dcdbas_pdev;
@@ -175,6 +175,9 @@ static ssize_t smi_data_write(struct kobject *kobj, char *buf, loff_t pos,
 {
 	ssize_t ret;
 
+	if ((pos + count) > MAX_SMI_DATA_BUF_SIZE)
+		return -EINVAL;
+
 	mutex_lock(&smi_data_lock);
 
 	ret = smi_data_buf_realloc(pos + count);
-- 
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