From db944b2b56c86fcf133745976763604d96110285 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sat, 21 Oct 2023 13:11:50 +0200
Subject: [PATCH] FFI: Fix dangling reference to CType in carith_checkarg().

Reported by Sergey Kaplun. #1108
---
 src/lj_carith.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/lj_carith.c b/src/lj_carith.c
index 96384e87..bad5fe66 100644
--- a/src/lj_carith.c
+++ b/src/lj_carith.c
@@ -42,9 +42,13 @@ static int carith_checkarg(lua_State *L, CTState *cts, CDArith *ca)
 	p = (uint8_t *)cdata_getptr(p, ct->size);
 	if (ctype_isref(ct->info)) ct = ctype_rawchild(cts, ct);
       } else if (ctype_isfunc(ct->info)) {
+	CTypeID id0 = i ? ctype_typeid(cts, ca->ct[0]) : 0;
 	p = (uint8_t *)*(void **)p;
 	ct = ctype_get(cts,
 	  lj_ctype_intern(cts, CTINFO(CT_PTR, CTALIGN_PTR|id), CTSIZE_PTR));
+	if (i) {  /* cts->tab may have been reallocated. */
+	  ca->ct[0] = ctype_get(cts, id0);
+	}
       }
       if (ctype_isenum(ct->info)) ct = ctype_child(cts, ct);
       ca->ct[i] = ct;