[llvm] r304114 - [ItaniumDemangle] Fix a exponential string copying bug

[Erik Pilkington via llvm-commits]

Author: epilk
Date: Sun May 28 18:24:52 2017
New Revision: 304114

URL: http://llvm.org/viewvc/llvm-project?rev=304114&view=rev
Log:
[ItaniumDemangle] Fix a exponential string copying bug

This is a port of libcxxabi's r304113.

Modified:
    llvm/trunk/lib/Demangle/ItaniumDemangle.cpp

Modified: llvm/trunk/lib/Demangle/ItaniumDemangle.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Demangle/ItaniumDemangle.cpp?rev=304114&r1=304113&r2=304114&view=diff
==============================================================================
--- llvm/trunk/lib/Demangle/ItaniumDemangle.cpp (original)
+++ llvm/trunk/lib/Demangle/ItaniumDemangle.cpp Sun May 28 18:24:52 2017
@@ -2525,6 +2525,9 @@ static std::string base_name(std::string
       ++p0;
       break;
     }
+    if (!isalpha(*p0) && !isdigit(*p0) && *p0 != '_') {
+      return std::string();
+    }
   }
   return std::string(p0, pe);
 }