[PATCH] firmware/dcdbas: add size check in smi_data_write

[Doug Warzecha <Douglas_Warzecha@dell.com>]

This patch adds 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>

---

--- linux-2.6.19-rc2/drivers/firmware/dcdbas.c.orig	2006-10-18 18:52:43.000000000 -0500
+++ linux-2.6.19-rc2/drivers/firmware/dcdbas.c	2006-10-18 18:55:08.000000000 -0500
@@ -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 kob
 {
 	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);