From 2bb6fe3854e2a4854bb89bfce4eaaea9d848fd1b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@ruby-lang.org>
Date: Wed, 8 Oct 2025 18:19:47 +0900
Subject: [Bug #21629] Initialize `struct RString`

---
 string.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

(limited to 'string.c')

diff --git a/string.c b/string.c
index a31aaece18..331f483136 100644
--- a/string.c
+++ b/string.c
@@ -655,14 +655,14 @@ rb_setup_fake_str(struct RString *fake_str, const char *name, long len, rb_encod
 VALUE
 rb_fstring_new(const char *ptr, long len)
 {
-    struct RString fake_str;
+    struct RString fake_str = {RBASIC_INIT};
     return register_fstring(setup_fake_str(&fake_str, ptr, len, ENCINDEX_US_ASCII), false, false);
 }
 
 VALUE
 rb_fstring_enc_new(const char *ptr, long len, rb_encoding *enc)
 {
-    struct RString fake_str;
+    struct RString fake_str = {RBASIC_INIT};
     return register_fstring(rb_setup_fake_str(&fake_str, ptr, len, enc), false, false);
 }
 
@@ -6497,7 +6497,7 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
                 val = rb_obj_as_string(rb_yield(match0));
             }
             else {
-                struct RString fake_str;
+                struct RString fake_str = {RBASIC_INIT};
                 VALUE key;
                 if (mode == FAST_MAP) {
                     // It is safe to use a fake_str here because we established that it won't escape,
@@ -12747,7 +12747,7 @@ rb_str_to_interned_str(VALUE str)
 VALUE
 rb_interned_str(const char *ptr, long len)
 {
-    struct RString fake_str;
+    struct RString fake_str = {RBASIC_INIT};
     return register_fstring(setup_fake_str(&fake_str, ptr, len, ENCINDEX_US_ASCII), true, false);
 }
 
@@ -12764,7 +12764,7 @@ rb_enc_interned_str(const char *ptr, long len, rb_encoding *enc)
         rb_enc_autoload(enc);
     }
 
-    struct RString fake_str;
+    struct RString fake_str = {RBASIC_INIT};
     return register_fstring(rb_setup_fake_str(&fake_str, ptr, len, enc), true, false);
 }
 
@@ -12775,7 +12775,7 @@ rb_enc_literal_str(const char *ptr, long len, rb_encoding *enc)
         rb_enc_autoload(enc);
     }
 
-    struct RString fake_str;
+    struct RString fake_str = {RBASIC_INIT};
     return register_fstring(rb_setup_fake_str(&fake_str, ptr, len, enc), true, true);
 }
 
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