llvm-undname: Fix oss-fuzz-foudn crash-on-invalid with incomplete special table nodes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358367 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Demangle/MicrosoftDemangle.cpp b/lib/Demangle/MicrosoftDemangle.cpp
index 882913a..2b41c00 100644
--- a/lib/Demangle/MicrosoftDemangle.cpp
+++ b/lib/Demangle/MicrosoftDemangle.cpp
@@ -276,6 +276,10 @@
SpecialTableSymbolNode *STSN = Arena.alloc<SpecialTableSymbolNode>();
STSN->Name = QN;
bool IsMember = false;
+ if (MangledName.empty()) {
+ Error = true;
+ return nullptr;
+ }
char Front = MangledName.popFront();
if (Front != '6' && Front != '7') {
Error = true;
diff --git a/test/Demangle/invalid-manglings.test b/test/Demangle/invalid-manglings.test
index eb22d1e..869d63a 100644
--- a/test/Demangle/invalid-manglings.test
+++ b/test/Demangle/invalid-manglings.test
@@ -119,3 +119,13 @@
; CHECK-EMPTY:
; CHECK-NEXT: ?foo@?$?_
; CHECK-NEXT: error: Invalid mangled name
+
+??_R4
+; CHECK-EMPTY:
+; CHECK-NEXT: ??_R4
+; CHECK-NEXT: error: Invalid mangled name
+
+??_R4foo@@
+; CHECK-EMPTY:
+; CHECK-NEXT: ??_R4foo@@
+; CHECK-NEXT: error: Invalid mangled name
