From 9bcbb734b0cdf45cd85d4e4b436d7a1c08557598 Mon Sep 17 00:00:00 2001
From: UnknownShadow200 <unknownshadow200@gmail.com>
Date: Tue, 2 Oct 2018 17:18:28 +1000
Subject: [PATCH] C client: Fix garbage blocks with inf id in rare case

small map, initially purely classic blocks only (so no upper array is sent by server), and you then tried to place a block above 256
---
 src/World.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/World.c b/src/World.c
index ae31c62f3..1c3fdc6d2 100644
--- a/src/World.c
+++ b/src/World.c
@@ -70,7 +70,7 @@ void World_SetBlock(Int32 x, Int32 y, Int32 z, BlockID block) {
 	/* defer allocation of second map array if possible */
 	if (World_Blocks == World_Blocks2) {
 		if (block < 256) return;
-		World_Blocks2 = Mem_Alloc(World_BlocksSize, 1, "blocks array upper");
+		World_Blocks2 = Mem_AllocCleared(World_BlocksSize, 1, "blocks array upper");
 		Block_SetUsedCount(768);
 	}
 	World_Blocks2[i] = (BlockRaw)(block >> 8);