From 03718bdb76a3d9dd9a28caf862d590e78a6739aa Mon Sep 17 00:00:00 2001
From: William Wilgus <me.theuser@yahoo.com>
Date: Fri, 9 Nov 2018 11:49:22 -0500
Subject: Lua fix reader bug in lzio

When loading a file, Lua may call the reader function again after it
returned end of input

https://www.lua.org/bugs.html#5.1.5-2

Change-Id: Ic2f4d727705a0b8f48ce792f6a9f7af25a503037
---
 apps/plugins/lua/lzio.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/apps/plugins/lua/lzio.c b/apps/plugins/lua/lzio.c
index 293edd59b0..54d5ec4741 100644
--- a/apps/plugins/lua/lzio.c
+++ b/apps/plugins/lua/lzio.c
@@ -22,10 +22,15 @@ int luaZ_fill (ZIO *z) {
   size_t size;
   lua_State *L = z->L;
   const char *buff;
+  if (!z->reader)
+    return EOZ;
   lua_unlock(L);
   buff = z->reader(L, z->data, &size);
   lua_lock(L);
-  if (buff == NULL || size == 0) return EOZ;
+  if (buff == NULL || size == 0) {
+    z->reader = NULL;  /* avoid calling reader function next time */
+    return EOZ;
+  }
   z->n = size - 1;
   z->p = buff;
   return char2int(*(z->p++));
-- 
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