From c94312d348e3530b369b4e517fce4c65df6cd270 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Mon, 10 Nov 2025 18:15:11 +0100
Subject: FFI: Avoid dangling cts->L.

Reported by ZumiKua. #1405
---
 src/lj_state.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src')

diff --git a/src/lj_state.c b/src/lj_state.c
index ecf15198..18a55e72 100644
--- a/src/lj_state.c
+++ b/src/lj_state.c
@@ -304,6 +304,10 @@ lua_State *lj_state_new(lua_State *L)
 void LJ_FASTCALL lj_state_free(global_State *g, lua_State *L)
 {
   lua_assert(L != mainthread(g));
+#if LJ_HASFFI
+  if (ctype_ctsG(g) && ctype_ctsG(g)->L == L)  /* Avoid dangling cts->L. */
+    ctype_ctsG(g)->L = mainthread(g);
+#endif
   lj_func_closeuv(L, tvref(L->stack));
   lua_assert(gcref(L->openupval) == NULL);
   lj_mem_freevec(g, tvref(L->stack), L->stacksize, TValue);
-- 
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