[libcxxabi] r309650 - [demangler] Fix another bug found by oss-fuzz in r309340

[Erik Pilkington via cfe-commits]

Author: epilk
Date: Mon Jul 31 19:38:41 2017
New Revision: 309650

URL: http://llvm.org/viewvc/llvm-project?rev=309650&view=rev
Log:
[demangler] Fix another bug found by oss-fuzz in r309340

Modified:
    libcxxabi/trunk/src/cxa_demangle.cpp
    libcxxabi/trunk/test/test_demangle.pass.cpp

Modified: libcxxabi/trunk/src/cxa_demangle.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/src/cxa_demangle.cpp?rev=309650&r1=309649&r2=309650&view=diff
==============================================================================
--- libcxxabi/trunk/src/cxa_demangle.cpp (original)
+++ libcxxabi/trunk/src/cxa_demangle.cpp Mon Jul 31 19:38:41 2017
@@ -5867,6 +5867,8 @@ parse_encoding(const char* first, const
                     if (t != last && *t == 'v')
                     {
                         ++t;
+                        if (db.names.empty())
+                            return first;
                         Node* name = db.names.back();
                         db.names.pop_back();
                         result = db.make<TopLevelFunctionDecl>(

Modified: libcxxabi/trunk/test/test_demangle.pass.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/test/test_demangle.pass.cpp?rev=309650&r1=309649&r2=309650&view=diff
==============================================================================
--- libcxxabi/trunk/test/test_demangle.pass.cpp (original)
+++ libcxxabi/trunk/test/test_demangle.pass.cpp Mon Jul 31 19:38:41 2017
@@ -29676,6 +29676,7 @@ const char* invalid_cases[] =
     "AT__ZSiIJEEAnwscT_T__",
     "FSiIJEENT_IoE ",
     "ZTVSiIZTVSiIZTVSiIZTVSiINIJEET_T_T_T_T_ ",
+    "_ZSiIJEvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvttvvvvvvET_v",
 };
 
 const unsigned NI = sizeof(invalid_cases) / sizeof(invalid_cases[0]);