From 2ec53df7abe554a22c3bdd985cbe101e22aaef7c Mon Sep 17 00:00:00 2001
From: Adam Ierymenko <adam.ierymenko@gmail.com>
Date: Wed, 14 Aug 2019 10:52:21 -0700
Subject: [PATCH] Put a limit on the multicast TX queue to prevent memory use
 ridiculousness.

---
 node/Multicaster.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/node/Multicaster.cpp b/node/Multicaster.cpp
index 67e133c0e..a25b7f05a 100644
--- a/node/Multicaster.cpp
+++ b/node/Multicaster.cpp
@@ -275,6 +275,11 @@ void Multicaster::send(
 				}
 			}
 		} else {
+			if (gs.txQueue.size() >= ZT_TX_QUEUE_SIZE) {
+				RR->t->outgoingNetworkFrameDropped(tPtr,network,src,mg.mac(),etherType,0,len,"multicast TX queue is full");
+				return;
+			}
+
 			const unsigned int gatherLimit = (limit - (unsigned int)gs.members.size()) + 1;
 
 			if ((gs.members.empty())||((now - gs.lastExplicitGather) >= ZT_MULTICAST_EXPLICIT_GATHER_DELAY)) {