From 478bcfe52a653bf338f17690147fa9f5793f5b42 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Sun, 8 Dec 2019 19:25:45 +0100
Subject: [PATCH] FFI: Workaround for platform dlerror() returning NULL.

Contributed by mcclure.
---
 src/lj_clib.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lj_clib.c b/src/lj_clib.c
index 8dc3c10e..dc72dced 100644
--- a/src/lj_clib.c
+++ b/src/lj_clib.c
@@ -118,12 +118,13 @@ static void *clib_loadlib(lua_State *L, const char *name, int global)
 		   RTLD_LAZY | (global?RTLD_GLOBAL:RTLD_LOCAL));
   if (!h) {
     const char *e, *err = dlerror();
-    if (*err == '/' && (e = strchr(err, ':')) &&
+    if (err && *err == '/' && (e = strchr(err, ':')) &&
 	(name = clib_resolve_lds(L, strdata(lj_str_new(L, err, e-err))))) {
       h = dlopen(name, RTLD_LAZY | (global?RTLD_GLOBAL:RTLD_LOCAL));
       if (h) return h;
       err = dlerror();
     }
+    if (!err) err = "dlopen failed";
     lj_err_callermsg(L, err);
   }
   return h;