https://git.ruby-lang.org/ruby.git/commit/?id=aa1d3c7d2c

From aa1d3c7d2c020ec927acaa487e8593172fb64bb0 Mon Sep 17 00:00:00 2001
From: sinisterchipmunk <sinisterchipmunk@g...>
Date: Wed, 22 Jan 2020 02:30:22 -0500
Subject: [ruby/fiddle] Initialize memory to 0 when calling Fiddle.malloc().
 (#24)

https://github.com/ruby/fiddle/commit/8414239ca3

diff --git a/ext/fiddle/fiddle.c b/ext/fiddle/fiddle.c
index 9f3d153..bb6b107 100644
--- a/ext/fiddle/fiddle.c
+++ b/ext/fiddle/fiddle.c
@@ -47,8 +47,9 @@ static VALUE https://github.com/ruby/ruby/blob/trunk/ext/fiddle/fiddle.c#L47
 rb_fiddle_malloc(VALUE self, VALUE size)
 {
     void *ptr;
-
-    ptr = (void*)ruby_xmalloc(NUM2SIZET(size));
+    size_t sizet = NUM2SIZET(size);
+    ptr = (void*)ruby_xmalloc(sizet);
+    memset(ptr, 0, sizet);
     return PTR2NUM(ptr);
 }
 
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