Fix a crash in rednet repeat

This crash can be triggered remotely by specially constructed rednet messages, making this a bit of a problem, as any repeaters can be remotely crashed.
ccserver · Sep 8, 2018 · b008eda · b008eda
1 parent 914df8b
commit b008eda
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua b/src/main/resources/assets/computercraft/lua/rom/programs/rednet/repeat.lua
@@ -44,7 +44,7 @@ local ok, error = pcall( function()
         if sEvent == "modem_message" then
             -- Got a modem message, rebroadcast it if it's a rednet thing
             if nChannel == rednet.CHANNEL_REPEAT then
-                if type( tMessage ) == "table" and tMessage.nMessageID and tMessage.nRecipient then
+                if type( tMessage ) == "table" and tMessage.nMessageID and tMessage.nRecipient and type(tMessage.nRecipient) == "number" then
                     if not tReceivedMessages[ tMessage.nMessageID ] then
                         -- Ensure we only repeat a message once
                         tReceivedMessages[ tMessage.nMessageID ] = true