string.c: terminate when embedded

* string.c (str_make_independent_expand): terminate String when
  moved from heap to embedded.  [Fix GH-821].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49405 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index c8707c62a6..ffe2e6233a 100644
--- a/string.c
+++ b/string.c
@@ -1593,6 +1593,7 @@ str_make_independent_expand(VALUE str, long expand)
 	ptr = RSTRING(str)->as.heap.ptr;
 	STR_SET_EMBED(str);
 	memcpy(RSTRING(str)->as.ary, ptr, len);
+	RSTRING(str)->as.ary[len] = '\0'; /* Ensure string is terminated */
 	STR_SET_EMBED_LEN(str, len);
 	return;
     }