Freeze Regexp literals

[Feature #8948] [Feature #16377]

Since Regexp literals always reference the same instance,
allowing to mutate them can lead to state leak.

1 files changed, 1 insertions, 0 deletions

diff --git a/re.c b/re.c
index 56b5144f9f..3efd540359 100644
--- a/re.c
+++ b/re.c
@@ -2967,6 +2967,7 @@ rb_reg_compile(VALUE str, int options, const char *sourcefile, int sourceline)
 	return Qnil;
     }
     FL_SET(re, REG_LITERAL);
+    rb_obj_freeze(re);
     return re;
 }