r258911 - Fix array index out of bounds

[Daniel Marjamaki via cfe-commits]

Author: danielmarjamaki
Date: Wed Jan 27 01:33:50 2016
New Revision: 258911

URL: http://llvm.org/viewvc/llvm-project?rev=258911&view=rev
Log:
Fix array index out of bounds

Differential Revision: http://reviews.llvm.org/D16582

Modified:
    cfe/trunk/lib/Driver/MSVCToolChain.cpp

Modified: cfe/trunk/lib/Driver/MSVCToolChain.cpp
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Driver/MSVCToolChain.cpp?rev=258911&r1=258910&r2=258911&view=diff
==============================================================================
--- cfe/trunk/lib/Driver/MSVCToolChain.cpp (original)
+++ cfe/trunk/lib/Driver/MSVCToolChain.cpp Wed Jan 27 01:33:50 2016
@@ -141,8 +141,8 @@ static bool getSystemRegistryString(cons
       nextKey++;
     size_t partialKeyLength = keyEnd - keyPath;
     char partialKey[256];
-    if (partialKeyLength > sizeof(partialKey))
-      partialKeyLength = sizeof(partialKey);
+    if (partialKeyLength >= sizeof(partialKey))
+      partialKeyLength = sizeof(partialKey) - 1;
     strncpy(partialKey, keyPath, partialKeyLength);
     partialKey[partialKeyLength] = '\0';
     HKEY hTopKey = NULL;