[Patch] UefiCpuPkg/MpLib: fix potential overflow issue.

[Eric Dong <eric.dong@intel.com>]

Current calculate timeout logic may have overflow if the input
timeout value too large. This patch fix this potential overflow
issue.

Cc: Michael Kinney <michael.d.kinney@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Eric Dong <eric.dong@intel.com>
---
 UefiCpuPkg/Library/MpInitLib/MpLib.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c
index ed1f55e..005dec4 100644
--- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
+++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
@@ -1001,6 +1001,9 @@ CalculateTimeout (
   OUT UINT64  *CurrentTime
   )
 {
+  UINT64 TimeoutInSeconds;
+  UINT64 TimestampCounterFreq;
+
   //
   // Read the current value of the performance counter
   //
@@ -1019,13 +1022,26 @@ CalculateTimeout (
   // in Hz. So multiply the return value with TimeoutInMicroseconds and then divide
   // it by 1,000,000, to get the number of ticks for the timeout value.
   //
-  return DivU64x32 (
-           MultU64x64 (
-             GetPerformanceCounterProperties (NULL, NULL),
-             TimeoutInMicroseconds
-             ),
-           1000000
-           );
+  TimestampCounterFreq = GetPerformanceCounterProperties (NULL, NULL);
+  if (DivU64x64Remainder (MAX_UINT64, TimeoutInMicroseconds, NULL) < TimestampCounterFreq) {
+    //
+    // Convert microseconds into seconds if direct multiplication overflows
+    //
+    TimeoutInSeconds = DivU64x32 (TimeoutInMicroseconds, 1000000);
+    //
+    // Assertion if the final tick count exceeds MAX_UINT64
+    //
+    ASSERT (DivU64x64Remainder (MAX_UINT64, TimeoutInSeconds, NULL) >= TimestampCounterFreq);
+    return MultU64x64 (TimestampCounterFreq, TimeoutInSeconds);
+  } else {
+    return DivU64x32 (
+             MultU64x64 (
+               GetPerformanceCounterProperties (NULL, NULL),
+               TimeoutInMicroseconds
+               ),
+             1000000
+             );
+  }
 }
 
 /**
-- 
2.7.0.windows.1