Fix infinite recursion for invalid declaration, by Dmitry Polukhin
Fix for a case found by fuzzing PR23057 (comment #25 https://llvm.org/bugs/show_bug.cgi?id=23057#c25).
Differential Revision: http://reviews.llvm.org/D16065
llvm-svn: 257461
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 797e07b..427ca5e 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -1184,7 +1184,7 @@
return LinkageInfo::none();
const Decl *OuterD = getOutermostFuncOrBlockContext(D);
- if (!OuterD)
+ if (!OuterD || OuterD->isInvalidDecl())
return LinkageInfo::none();
LinkageInfo LV;
diff --git a/clang/test/SemaCXX/linkage-invalid-decl.cpp b/clang/test/SemaCXX/linkage-invalid-decl.cpp
new file mode 100644
index 0000000..0a991ba
--- /dev/null
+++ b/clang/test/SemaCXX/linkage-invalid-decl.cpp
@@ -0,0 +1,9 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+// This invalid declaration used to call infinite recursion in linkage
+// calculation for enum as a function argument.
+inline foo(A)(enum E;
+// expected-error@-1 {{unknown type name 'foo'}}
+// expected-error@-2 {{ISO C++ forbids forward references to 'enum' types}}
+// expected-error@-3 {{expected ')'}}
+// expected-note@-4 {{to match this '('}}