SSU: Fix packet-too-large check in UDPSender

2022-04-05 07:55:28 -04:00
parent e43810f182
commit 75492514ca
1 changed files with 2 additions and 1 deletions
--- a/router/java/src/net/i2p/router/transport/udp/UDPSender.java
+++ b/router/java/src/net/i2p/router/transport/udp/UDPSender.java
@@ -193,7 +193,8 @@ class UDPSender {
    public void add(UDPPacket packet) {
        if (packet == null || !_keepRunning) return;
        int psz = packet.getPacket().getLength();
-        if (psz > PeerState2.MAX_MTU) {
+        // minus IP header and UDP header, assume IPv4, this is just a quick check
+        if (psz > PeerState2.MAX_MTU - 28) {
            _log.error("Dropping large UDP packet " + psz + " bytes: " + packet, new Exception());
            return;
        }