https://git.ruby-lang.org/ruby.git/commit/?id=8ccc12118e

From 8ccc12118ea5257f846476088eb9c64944560892 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Sat, 6 Mar 2021 00:45:56 +0900
Subject: Keep libpath length non-negative [Bug #16784]

When runtime_libruby_path does not include '/', it attempts to call
rb_str_resize with negative length. This change makes sure that the
length non-negative.

Co-Authored-By: xtkoba (Tee KOBAYASHI) <xtkoba+ruby@g...>
---
 ruby.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ruby.c b/ruby.c
index b94937b..f297c2b 100644
--- a/ruby.c
+++ b/ruby.c
@@ -671,8 +671,11 @@ ruby_init_loadpath(void) https://github.com/ruby/ruby/blob/trunk/ruby.c#L671
 	    p = p2;
 	}
 #endif
+        baselen = p - libpath;
+    }
+    else {
+        baselen = 0;
     }
-    baselen = p - libpath;
     rb_str_resize(sopath, baselen);
     libpath = RSTRING_PTR(sopath);
 #define PREFIX_PATH() sopath
-- 
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