https://git.ruby-lang.org/ruby.git/commit/?id=38e98cbdb7

From 38e98cbdb7c429d0042fd24efd9fec6516fb45f5 Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Wed, 24 Nov 2021 00:20:42 +0900
Subject: [ruby/bigdecimal] Keep obj-to-Real link when VpReallocReal returns
 different pointer

https://github.com/ruby/bigdecimal/commit/252748de17
---
 ext/bigdecimal/bigdecimal.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 1cbdbd88326..668d9d1d4d3 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -869,7 +869,18 @@ VpCreateRbObject(size_t mx, const char *str, bool raise_exception) https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L869
 }
 
 #define VpAllocReal(prec) (Real *)VpMemAlloc(offsetof(Real, frac) + (prec) * sizeof(DECDIG))
-#define VpReallocReal(ptr, prec) (Real *)VpMemRealloc((ptr), offsetof(Real, frac) + (prec) * sizeof(DECDIG))
+
+static Real *
+VpReallocReal(Real *pv, size_t prec)
+{
+    VALUE obj = pv ? pv->obj : 0;
+    Real *new_pv = (Real *)VpMemRealloc(pv, offsetof(Real, frac) + prec * sizeof(DECDIG));
+    if (obj) {
+        new_pv->obj = 0;
+        BigDecimal_wrap_struct(obj, new_pv);
+    }
+    return new_pv;
+}
 
 static Real *
 VpCopy(Real *pv, Real const* const x)
-- 
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