From 5e2318dd37a51948aaf845c7d920b11f47cdcfe6 Mon Sep 17 00:00:00 2001
From: Jiaxin Wu <jiaxin.wu@intel.com>
Date: Fri, 11 Mar 2016 11:02:00 +0800
Subject: CryptoPkg: Fix the potential system hang issue

This patch is used to fix the potential system hang
caused by the NULL 'time' parameter usage.

Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Long Qin <qin.long@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jiaxin Wu <jiaxin.wu@intel.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
---
 .../Library/BaseCryptLib/SysCall/TimerWrapper.c    | 29 +++++++++++++---------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
index 6422d610f3..93e487dcef 100644
--- a/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
+++ b/CryptoPkg/Library/BaseCryptLib/SysCall/TimerWrapper.c
@@ -2,7 +2,7 @@
   C Run-Time Libraries (CRT) Time Management Routines Wrapper Implementation
   for OpenSSL-based Cryptographic Library (used in DXE & RUNTIME).
 
-Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2010 - 2016, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
@@ -73,6 +73,7 @@ UINTN CumulativeDays[2][14] = {
 time_t time (time_t *timer)
 {
   EFI_TIME  Time;
+  time_t    CalTime;
   UINTN     Year;
 
   //
@@ -84,22 +85,26 @@ time_t time (time_t *timer)
   // Years Handling
   // UTime should now be set to 00:00:00 on Jan 1 of the current year.
   //
-  for (Year = 1970, *timer = 0; Year != Time.Year; Year++) {
-    *timer = *timer + (time_t)(CumulativeDays[IsLeap(Year)][13] * SECSPERDAY);
+  for (Year = 1970, CalTime = 0; Year != Time.Year; Year++) {
+    CalTime = CalTime + (time_t)(CumulativeDays[IsLeap(Year)][13] * SECSPERDAY);
   }
 
   //
   // Add in number of seconds for current Month, Day, Hour, Minute, Seconds, and TimeZone adjustment
   //
-  *timer = *timer + 
-           (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +
-           (time_t)(CumulativeDays[IsLeap(Time.Year)][Time.Month] * SECSPERDAY) + 
-           (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) + 
-           (time_t)(Time.Hour * SECSPERHOUR) + 
-           (time_t)(Time.Minute * 60) + 
-           (time_t)Time.Second;
-
-  return *timer;
+  CalTime = CalTime + 
+            (time_t)((Time.TimeZone != EFI_UNSPECIFIED_TIMEZONE) ? (Time.TimeZone * 60) : 0) +
+            (time_t)(CumulativeDays[IsLeap(Time.Year)][Time.Month] * SECSPERDAY) + 
+            (time_t)(((Time.Day > 0) ? Time.Day - 1 : 0) * SECSPERDAY) + 
+            (time_t)(Time.Hour * SECSPERHOUR) + 
+            (time_t)(Time.Minute * 60) + 
+            (time_t)Time.Second;
+
+  if (timer != NULL) {
+    *timer = CalTime;
+  }
+
+  return CalTime;
 }
 
 //
-- 
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