From 84477e148dccf4665067c0d39006f31bb073cc9e Mon Sep 17 00:00:00 2001
From: Brooks Davis <brooks@one-eyed-alien.net>
Date: Thu, 27 Oct 2022 23:39:06 +0100
Subject: [PATCH] lua: cast through uintptr_t when return a pointer

Don't assume size_t can carry pointer provenance and use uintptr_t
(identialy on all current platforms) instead.

Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Signed-off-by: Brooks Davis <brooks.davis@sri.com>
Closes #14131
---
 module/lua/lapi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/module/lua/lapi.c b/module/lua/lapi.c
index ed3a0f4cf9..703cf4cc2a 100644
--- a/module/lua/lapi.c
+++ b/module/lua/lapi.c
@@ -444,7 +444,7 @@ LUA_API const void *lua_topointer (lua_State *L, int idx) {
     case LUA_TTABLE: return hvalue(o);
     case LUA_TLCL: return clLvalue(o);
     case LUA_TCCL: return clCvalue(o);
-    case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o)));
+    case LUA_TLCF: return cast(void *, cast(uintptr_t, fvalue(o)));
     case LUA_TTHREAD: return thvalue(o);
     case LUA_TUSERDATA:
     case LUA_TLIGHTUSERDATA: