From e157a844180ca96bd26e392e8aa661af45da44ef Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Sat, 9 Jul 2022 17:27:27 +0900
Subject: [PATCH] bigint.c (mpz_init_set_int): should avoid integer overflow.

Check MRB_INT_MIN which could overflow by negation.
---
 mrbgems/mruby-bigint/core/bigint.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mrbgems/mruby-bigint/core/bigint.c b/mrbgems/mruby-bigint/core/bigint.c
index 49ea13a8c..db00ea858 100644
--- a/mrbgems/mruby-bigint/core/bigint.c
+++ b/mrbgems/mruby-bigint/core/bigint.c
@@ -66,7 +66,8 @@ mpz_init_set_int(mrb_state *mrb, mpz_t *y, mrb_int v)
   y->p = (mp_limb*)mrb_malloc(mrb, sizeof(mp_limb)*2);
   if (v < 0) {
     y->sn = -1;
-    u = -v;
+    if (v == MRB_INT_MIN) u = v;
+    else u = -v;
   }
   else if (v > 0) {
     y->sn = 1;