CPlusPlus: Fix parser crash

The parseCompoundStatement() function can return without setting the
output parameter if the maximum statement depth is exceeded.

Task-number: QTCREATORBUG-29847
Change-Id: Ifd76cd948c30498863246a1b80bd0657950101ca
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libs/3rdparty/cplusplus/Parser.cpp b/src/libs/3rdparty/cplusplus/Parser.cpp
index 395556777d..30e3fe0be1 100644
--- a/src/libs/3rdparty/cplusplus/Parser.cpp
+++ b/src/libs/3rdparty/cplusplus/Parser.cpp
@@ -4946,8 +4946,8 @@ bool Parser::parsePrimaryExpression(ExpressionAST *&node)
             CompoundExpressionAST *ast = new (_pool) CompoundExpressionAST;
             ast->lparen_token = consumeToken();
             StatementAST *statement = nullptr;
-            parseCompoundStatement(statement);
-            ast->statement = statement->asCompoundStatement();
+            if (parseCompoundStatement(statement))
+                ast->statement = statement->asCompoundStatement();
             match(T_RPAREN, &ast->rparen_token);
             node = ast;
             return true;