https://git.ruby-lang.org/ruby.git/commit/?id=da36d5700d

From da36d5700d9e0e66411d93595b6f654c85853fa1 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 7 Aug 2019 12:03:52 +0000
Subject: merge revision(s) 53e9908d8afc7f03109b0aafd1698ab35f512b05: [Backport
 #15916]

	Fix memory leak

	* string.c (str_replace_shared_without_enc): free previous buffer
	  before replaced.

	* parse.y (gettable): make sure in advance that the `__FILE__`
	  object shares a fstring, to get rid of replacement with the
	  fstring later.
	  TODO: this hack may be needed in other places.

	[Bug #15916]

	Co-Authored-By: luke-gru (Luke Gruber) <luke.gru@g...>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67732 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

diff --git a/parse.y b/parse.y
index 42f1a8f..473ae0e 100644
--- a/parse.y
+++ b/parse.y
@@ -8760,7 +8760,7 @@ gettable(struct parser_params *p, ID id, const YYLTYPE *loc) https://github.com/ruby/ruby/blob/trunk/parse.y#L8760
 	    if (NIL_P(file))
 		file = rb_str_new(0, 0);
 	    else
-		file = rb_str_dup(file);
+		file = rb_str_dup(rb_fstring(file));
 	    node = NEW_STR(add_mark_object(p, file), loc);
 	}
 	return node;
diff --git a/string.c b/string.c
index d0057b7..847533a 100644
--- a/string.c
+++ b/string.c
@@ -1164,6 +1164,13 @@ str_replace_shared_without_enc(VALUE str2, VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L1164
     }
     else {
 	str = rb_str_new_frozen(str);
+        if (!STR_EMBED_P(str2) && !FL_TEST_RAW(str2, STR_SHARED|STR_NOFREE)) {
+            /* TODO: check if str2 is a shared root */
+            char *ptr2 = STR_HEAP_PTR(str2);
+            if (STR_HEAP_PTR(str) != ptr2) {
+                ruby_sized_xfree(ptr2, STR_HEAP_SIZE(str2));
+            }
+        }
 	FL_SET(str2, STR_NOEMBED);
 	RSTRING_GETMEM(str, ptr, len);
 	RSTRING(str2)->as.heap.len = len;
diff --git a/version.h b/version.h
index 8114f6b..0bd57f4 100644
--- a/version.h
+++ b/version.h
@@ -1,6 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L1
 #define RUBY_VERSION "2.6.3"
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 82
+#define RUBY_PATCHLEVEL 83
 
 #define RUBY_RELEASE_YEAR 2019
 #define RUBY_RELEASE_MONTH 8
-- 
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