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TNT: Fix up nil derefs

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I spotted two places where under stress (many explosions) luajit would
end up passing nil to these functions. I'm not entirely sure how,
but it seems good form to guard against it, which does make it
more robust. After this patch, I'm not able to crash the server. With
many explosions, it may still lag significantly, but always returns
in the end.
This commit is contained in:
Auke Kok 2016-03-28 18:20:14 -07:00 committed by paramat
parent da5f4a939e
commit 0736d30e33
1 changed files with 6 additions and 3 deletions
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9
mods/tnt/init.lua
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@ -51,9 +51,9 @@ local function eject_drops(drops, pos, radius)
local count = item:get_count() local count = item:get_count()
local take_est = math.log(count * count) + math.random(0,4) - 2 local take_est = math.log(count * count) + math.random(0,4) - 2
while count > 0 do while count > 0 do
local take = math.min(take_est, local take = math.max(1,math.min(take_est,
item:get_count(), item:get_count(),
item:get_stack_max()) item:get_stack_max()))
rand_pos(pos, drop_pos, radius) rand_pos(pos, drop_pos, radius)
local obj = minetest.add_item(drop_pos, item:get_name() .. " " .. take) local obj = minetest.add_item(drop_pos, item:get_name() .. " " .. take)
if obj then if obj then
@ -165,7 +165,10 @@ local function add_effects(pos, radius, drops)
local count = stack:get_count() local count = stack:get_count()
if count > most then if count > most then
most = count most = count
texture = minetest.registered_nodes[name].tiles[1] local def = minetest.registered_nodes[name]
if def and def.tiles and def.tiles[1] then
texture = def.tiles[1]
end
end end
end end