From 415671a28273e5bfbe9aa00a0e386f025720ac23 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@ruby-lang.org>
Date: Fri, 12 Nov 2021 14:37:16 +0900
Subject: [PATCH] parse.y: Fix memory leak at parse error

Local variable tables might leak at the parse error.
---
 parse.y | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/parse.y b/parse.y
index 6461b73c73..8bfb7f2757 100644
--- a/parse.y
+++ b/parse.y
@@ -6353,11 +6353,17 @@ yycompile(VALUE vparser, struct parser_params *p, VALUE fname, int line)
     }
     p->ruby_sourceline = line - 1;
 
+    p->lvtbl = NULL;
+
     p->ast = ast = rb_ast_new();
     rb_suppress_tracing(yycompile0, (VALUE)p);
     p->ast = 0;
     RB_GC_GUARD(vparser); /* prohibit tail call optimization */
 
+    while (p->lvtbl) {
+        local_pop(p);
+    }
+
     return ast;
 }
 #endif /* !RIPPER */