Harden InitListExpr::isStringLiteralInit() against getInit() returning null.

This led to a crash on invalid code (sorry, no good test case).

Fixes <rdar://problem/15831804>.

llvm-svn: 199571

1 files changed, 5 insertions, 1 deletions

diff --git a/clang/lib/AST/Expr.cpp b/clang/lib/AST/Expr.cpp
index 842b8c7fdef..154aa4c5380 100644
--- a/clang/lib/AST/Expr.cpp
+++ b/clang/lib/AST/Expr.cpp
@@ -1869,7 +1869,11 @@ bool InitListExpr::isStringLiteralInit() const {
   const ArrayType *AT = getType()->getAsArrayTypeUnsafe();
   if (!AT || !AT->getElementType()->isIntegerType())
     return false;
-  const Expr *Init = getInit(0)->IgnoreParens();
+  // It is possible for getInit() to return null.
+  const Expr *Init = getInit(0);
+  if (!Init)
+    return false;
+  Init = Init->IgnoreParens();
   return isa<StringLiteral>(Init) || isa<ObjCEncodeExpr>(Init);
 }