Voxelmanip: Do not emerge or blit to blocks over map gen limit

Placing a structure that extends into mapblocks that extend past map_gen_limit causes a crash. For example a sapling growing at the world edge which adds leaves beyond the edge, or placing a structure using the lua voxelmanip, or placing a schematic or l-system tree. Do not run the 'load_if_inexistent' block of code if the mapblock is over limit, this also marks the mapblock with the flag VMANIP_BLOCK_DATA_INEXIST which later prevents blitting back those mapblocks. This fix therefore uses existing functionality by having the same effect as the 'load_if_inexistent' bool being false.
minetest · Feb 18, 2017 · 111e7e1 · 111e7e1
1 parent d0a6cac
commit 111e7e1
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/map.cpp b/src/map.cpp
@@ -3161,7 +3161,7 @@ void MMVManip::initialEmerge(v3s16 blockpos_min, v3s16 blockpos_max,
 		if(block_data_inexistent)
 		{
 
-			if (load_if_inexistent) {
+			if (load_if_inexistent && !blockpos_over_limit(p)) {
 				ServerMap *svrmap = (ServerMap *)m_map;
 				block = svrmap->emergeBlock(p, false);
 				if (block == NULL)