From 2db6b07de1e45c56f6135363939dbb3781336514 Mon Sep 17 00:00:00 2001
From: SmallJoker <SmallJoker@users.noreply.github.com>
Date: Sun, 20 Jun 2021 17:21:50 +0200
Subject: [PATCH] Inventory: show error on invalid list names (#11368)

---
 src/inventory.h                 |  1 +
 src/script/common/c_content.cpp | 26 ++++++++++++++------------
 2 files changed, 15 insertions(+), 12 deletions(-)

diff --git a/src/inventory.h b/src/inventory.h
index f36bc57cf..fbf995fab 100644
--- a/src/inventory.h
+++ b/src/inventory.h
@@ -298,6 +298,7 @@ public:
 	void serialize(std::ostream &os, bool incremental = false) const;
 	void deSerialize(std::istream &is);
 
+	// Adds a new list or clears and resizes an existing one
 	InventoryList * addList(const std::string &name, u32 size);
 	InventoryList * getList(const std::string &name);
 	const InventoryList * getList(const std::string &name) const;
diff --git a/src/script/common/c_content.cpp b/src/script/common/c_content.cpp
index 52baeae9d..f8cc40927 100644
--- a/src/script/common/c_content.cpp
+++ b/src/script/common/c_content.cpp
@@ -1350,26 +1350,28 @@ void read_inventory_list(lua_State *L, int tableindex,
 {
 	if(tableindex < 0)
 		tableindex = lua_gettop(L) + 1 + tableindex;
+
 	// If nil, delete list
 	if(lua_isnil(L, tableindex)){
 		inv->deleteList(name);
 		return;
 	}
-	// Otherwise set list
+
+	// Get Lua-specified items to insert into the list
 	std::vector<ItemStack> items = read_items(L, tableindex,srv);
-	int listsize = (forcesize != -1) ? forcesize : items.size();
+	size_t listsize = (forcesize > 0) ? forcesize : items.size();
+
+	// Create or clear list
 	InventoryList *invlist = inv->addList(name, listsize);
-	int index = 0;
-	for(std::vector<ItemStack>::const_iterator
-			i = items.begin(); i != items.end(); ++i){
-		if(forcesize != -1 && index == forcesize)
-			break;
-		invlist->changeItem(index, *i);
-		index++;
+	if (!invlist) {
+		luaL_error(L, "inventory list: cannot create list named '%s'", name);
+		return;
 	}
-	while(forcesize != -1 && index < forcesize){
-		invlist->deleteItem(index);
-		index++;
+
+	for (size_t i = 0; i < items.size(); ++i) {
+		if (i == listsize)
+			break; // Truncate provided list of items
+		invlist->changeItem(i, items[i]);
 	}
 }