https://git.ruby-lang.org/ruby.git/commit/?id=952ff7fbb3

From 952ff7fbb3d1d4e9f13a4124016cb805c3a06a51 Mon Sep 17 00:00:00 2001
From: Samuel Williams <samuel.williams@o...>
Date: Wed, 25 May 2022 19:49:51 +1200
Subject: Fix out of bounds read.

---
 io.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/io.c b/io.c
index defdecd7d9..dab1d945f9 100644
--- a/io.c
+++ b/io.c
@@ -2096,8 +2096,7 @@ rb_io_writev(VALUE io, int argc, const VALUE *argv) https://github.com/ruby/ruby/blob/trunk/io.c#L2096
 
         do rb_io_write(io, *argv++); while (--argc);
 
-        /* unused right now */
-        return argv[0];
+        return Qnil;
     }
 
     return rb_funcallv(io, id_write, argc, argv);
-- 
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