From 96f0dd3cbc404b7f96bd7a35247faea8da266638 Mon Sep 17 00:00:00 2001
From: Damien George <damien.p.george@gmail.com>
Date: Fri, 24 Jul 2015 15:05:56 +0000
Subject: py/parse: Fix handling of empty input so it raises an exception.

---
 py/parse.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'py/parse.c')

diff --git a/py/parse.c b/py/parse.c
index ad13a90309..b20fdaacd2 100644
--- a/py/parse.c
+++ b/py/parse.c
@@ -720,6 +720,11 @@ memory_error:
         goto syntax_error;
     }
 
+    // check that parsing resulted in a parse node (can fail on empty input)
+    if (parser.result_stack_top == 0) {
+        goto syntax_error;
+    }
+
     //result_stack_show(parser);
     //printf("rule stack alloc: %d\n", parser.rule_stack_alloc);
     //printf("result stack alloc: %d\n", parser.result_stack_alloc);
-- 
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