[index] Return when DC is null in handleReference

Summary:
DC may sometimes be NULL and getContainerInfo(DC, Container) will dereference a null pointer.

Default template arguments (the following example and many test files in https://github.com/nlohmann/json)
may cause null pointer dereference.

```c++
template <typename>
struct actor;

template <template <typename> class Actor = actor>
struct terminal;
```

In tools/libclang/CXIndexDataConsumer.cpp#L203

    handleReference(ND, Loc, Cursor,
                    dyn_cast_or_null<NamedDecl>(ASTNode.Parent),
                    ASTNode.ContainerDC, ASTNode.OrigE, Kind);

`dyn_cast_or_null<NamedDecl>(ASTNode.Parent)` is somehow a null pointer and in tools/libclang/CXIndexDataConsumer.cpp:935

  ContainerInfo Container;
  getContainerInfo(DC, Container);

The null DC is casted `ContInfo.cursor = getCursor(cast<Decl>(DC));` and SIGSEGV.

```

See discussions in https://github.com/jacobdufault/cquery/issues/219 https://github.com/jacobdufault/cquery/issues/192

Reviewers: akyrtzi, sammccall, yvvan

Reviewed By: sammccall

Subscribers: mehdi_amini, cfe-commits

Differential Revision: https://reviews.llvm.org/D41575

llvm-svn: 322017

1 files changed, 2 insertions, 2 deletions

diff --git a/clang/tools/libclang/CXIndexDataConsumer.cpp b/clang/tools/libclang/CXIndexDataConsumer.cpp
index 89ac23be734..0db6f0c1f07 100644
--- a/clang/tools/libclang/CXIndexDataConsumer.cpp
+++ b/clang/tools/libclang/CXIndexDataConsumer.cpp
@@ -890,7 +890,7 @@ bool CXIndexDataConsumer::handleReference(const NamedDecl *D, SourceLocation Loc
                                       const DeclContext *DC,
                                       const Expr *E,
                                       CXIdxEntityRefKind Kind) {
-  if (!D)
+  if (!D || !DC)
     return false;
 
   CXCursor Cursor = E ? MakeCXCursor(E, cast<Decl>(DC), CXTU)
@@ -907,7 +907,7 @@ bool CXIndexDataConsumer::handleReference(const NamedDecl *D, SourceLocation Loc
   if (!CB.indexEntityReference)
     return false;
 
-  if (!D)
+  if (!D || !DC)
     return false;
   if (Loc.isInvalid())
     return false;