https://git.ruby-lang.org/ruby.git/commit/?id=a5b809e994

From a5b809e994ce10d265e73f8c9d7c042e5e84d171 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Fri, 23 Aug 2019 13:00:17 +0900
Subject: Check metadata a bit more


diff --git a/ext/digest/digest.c b/ext/digest/digest.c
index 73655c5..a59f880 100644
--- a/ext/digest/digest.c
+++ b/ext/digest/digest.c
@@ -554,10 +554,22 @@ get_digest_base_metadata(VALUE klass) https://github.com/ruby/ruby/blob/trunk/ext/digest/digest.c#L554
     if (NIL_P(p))
         rb_raise(rb_eRuntimeError, "Digest::Base cannot be directly inherited in Ruby");
 
+    if (!RB_TYPE_P(obj, T_DATA) || RTYPEDDATA_P(obj)) {
+      wrong:
+        if (p == klass)
+            rb_raise(rb_eTypeError, "%"PRIsVALUE"::metadata is not initialized properly",
+                     klass);
+        else
+            rb_raise(rb_eTypeError, "%"PRIsVALUE"(%"PRIsVALUE")::metadata is not initialized properly",
+                     klass, p);
+    }
+
 #undef RUBY_UNTYPED_DATA_WARNING
 #define RUBY_UNTYPED_DATA_WARNING 0
     Data_Get_Struct(obj, rb_digest_metadata_t, algo);
 
+    if (!algo) goto wrong;
+
     switch (algo->api_version) {
       case 3:
         break;
-- 
cgit v0.10.2


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