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Fix for large move vectors crashing server

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Check movement distance also based on current position.
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Spottedleaf 2020-10-11 18:48:05 -04:00 committed by Aikar
parent 217702d573
commit cbecca2636
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1 changed files with 66 additions and 0 deletions
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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <spottedleaf@spottedleaf.dev>
Date: Sun, 17 May 2020 23:47:33 -0700
Subject: [PATCH] Fix for large move vectors crashing server
Check movement distance also based on current position.
diff --git a/src/main/java/net/minecraft/server/PlayerConnection.java b/src/main/java/net/minecraft/server/PlayerConnection.java
index 05b3a7478195037927cd1a902b603862d9747e61..4b0ff3e1acd91e0f28af9a900a4868c5a3b76caa 100644
--- a/src/main/java/net/minecraft/server/PlayerConnection.java
+++ b/src/main/java/net/minecraft/server/PlayerConnection.java
@@ -326,19 +326,24 @@ public class PlayerConnection implements PacketListenerPlayIn {
if (entity != this.player && entity.getRidingPassenger() == this.player && entity == this.r) {
WorldServer worldserver = this.player.getWorldServer();
- double d0 = entity.locX();
- double d1 = entity.locY();
- double d2 = entity.locZ();
- double d3 = packetplayinvehiclemove.getX();
- double d4 = packetplayinvehiclemove.getY();
- double d5 = packetplayinvehiclemove.getZ();
+ double d0 = entity.locX();double fromX = d0; // Paper - OBFHELPER
+ double d1 = entity.locY();double fromY = d1; // Paper - OBFHELPER
+ double d2 = entity.locZ();double fromZ = d2; // Paper - OBFHELPER
+ double d3 = packetplayinvehiclemove.getX();double toX = d3; // Paper - OBFHELPER
+ double d4 = packetplayinvehiclemove.getY();double toY = d4; // Paper - OBFHELPER
+ double d5 = packetplayinvehiclemove.getZ();double toZ = d5; // Paper - OBFHELPER
float f = packetplayinvehiclemove.getYaw();
float f1 = packetplayinvehiclemove.getPitch();
double d6 = d3 - this.s;
double d7 = d4 - this.t;
double d8 = d5 - this.u;
double d9 = entity.getMot().g();
- double d10 = d6 * d6 + d7 * d7 + d8 * d8;
+ // Paper start - fix large move vectors killing the server
+ double currDeltaX = toX - fromX;
+ double currDeltaY = toY - fromY;
+ double currDeltaZ = toZ - fromZ;
+ double d10 = Math.max(d6 * d6 + d7 * d7 + d8 * d8, (currDeltaX * currDeltaX + currDeltaY * currDeltaY + currDeltaZ * currDeltaZ) - 1);
+ // Paper end - fix large move vectors killing the server
// CraftBukkit start - handle custom speeds and skipped ticks
@@ -997,7 +1002,7 @@ public class PlayerConnection implements PacketListenerPlayIn {
double d2 = this.player.locZ();
double d3 = this.player.locY();
double d4 = packetplayinflying.a(this.player.locX());double toX = d4; // Paper - OBFHELPER
- double d5 = packetplayinflying.b(this.player.locY());
+ double d5 = packetplayinflying.b(this.player.locY());double toY = d5; // Paper - OBFHELPER
double d6 = packetplayinflying.c(this.player.locZ());double toZ = d6; // Paper - OBFHELPER
float f = packetplayinflying.a(this.player.yaw);
float f1 = packetplayinflying.b(this.player.pitch);
@@ -1005,7 +1010,12 @@ public class PlayerConnection implements PacketListenerPlayIn {
double d8 = d5 - this.m;
double d9 = d6 - this.n;
double d10 = this.player.getMot().g();
- double d11 = d7 * d7 + d8 * d8 + d9 * d9;
+ // Paper start - fix large move vectors killing the server
+ double currDeltaX = toX - prevX;
+ double currDeltaY = toY - prevY;
+ double currDeltaZ = toZ - prevZ;
+ double d11 = Math.max(d7 * d7 + d8 * d8 + d9 * d9, (currDeltaX * currDeltaX + currDeltaY * currDeltaY + currDeltaZ * currDeltaZ) - 1);
+ // Paper end - fix large move vectors killing the server
if (this.player.isSleeping()) {
if (d11 > 1.0D) {