From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Spottedleaf 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/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java index 5d8b1fb9ee96ca397b8f3a0629bc4273ee21f41c..a1f17d1044d6ecb05c98af45e77f92229e377114 100644 --- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java +++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java @@ -492,9 +492,9 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl float prevYaw = this.player.getYRot(); float prevPitch = this.player.getXRot(); // CraftBukkit end - double d0 = entity.getX(); - double d1 = entity.getY(); - double d2 = entity.getZ(); + double d0 = entity.getX();final double fromX = d0; // Paper - OBFHELPER + double d1 = entity.getY();final double fromY = d1; // Paper - OBFHELPER + double d2 = entity.getZ();final double fromZ = d2; // Paper - OBFHELPER double d3 = ServerGamePacketListenerImpl.clampHorizontal(packet.getX()); final double toX = d3; // Paper - OBFHELPER double d4 = ServerGamePacketListenerImpl.clampVertical(packet.getY()); final double toY = d4; // Paper - OBFHELPER double d5 = ServerGamePacketListenerImpl.clampHorizontal(packet.getZ()); final double toZ = d5; // Paper - OBFHELPER @@ -504,7 +504,16 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl double d7 = d4 - this.vehicleFirstGoodY; double d8 = d5 - this.vehicleFirstGoodZ; double d9 = entity.getDeltaMovement().lengthSqr(); - 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); + double otherFieldX = d3 - this.vehicleLastGoodX; + double otherFieldY = d4 - this.vehicleLastGoodY - 1.0E-6D; + double otherFieldZ = d5 - this.vehicleLastGoodZ; + d10 = Math.max(d10, (otherFieldX * otherFieldX + otherFieldY * otherFieldY + otherFieldZ * otherFieldZ) - 1); + // Paper end - fix large move vectors killing the server // CraftBukkit start - handle custom speeds and skipped ticks this.allowedPlayerTicks += (System.currentTimeMillis() / 50) - this.lastTick; @@ -550,9 +559,9 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl boolean flag = worldserver.noCollision(entity, entity.getBoundingBox().deflate(0.0625D)); - d6 = d3 - this.vehicleLastGoodX; - d7 = d4 - this.vehicleLastGoodY - 1.0E-6D; - d8 = d5 - this.vehicleLastGoodZ; + d6 = d3 - this.vehicleLastGoodX; // Paper - diff on change, used for checking large move vectors above + d7 = d4 - this.vehicleLastGoodY - 1.0E-6D; // Paper - diff on change, used for checking large move vectors above + d8 = d5 - this.vehicleLastGoodZ; // Paper - diff on change, used for checking large move vectors above boolean flag1 = entity.verticalCollisionBelow; if (entity instanceof LivingEntity) { @@ -1259,7 +1268,16 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl double d7 = d1 - this.firstGoodY; double d8 = d2 - this.firstGoodZ; double d9 = this.player.getDeltaMovement().lengthSqr(); - double d10 = d6 * d6 + d7 * d7 + d8 * d8; + // Paper start - fix large move vectors killing the server + double currDeltaX = toX - prevX; + double currDeltaY = toY - prevY; + double currDeltaZ = toZ - prevZ; + double d10 = Math.max(d6 * d6 + d7 * d7 + d8 * d8, (currDeltaX * currDeltaX + currDeltaY * currDeltaY + currDeltaZ * currDeltaZ) - 1); + double otherFieldX = d0 - this.lastGoodX; + double otherFieldY = d1 - this.lastGoodY; + double otherFieldZ = d2 - this.lastGoodZ; + d10 = Math.max(d10, (otherFieldX * otherFieldX + otherFieldY * otherFieldY + otherFieldZ * otherFieldZ) - 1); + // Paper end - fix large move vectors killing the server if (this.player.isSleeping()) { if (d10 > 1.0D) { @@ -1315,9 +1333,9 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl AABB axisalignedbb = this.player.getBoundingBox(); - d6 = d0 - this.lastGoodX; - d7 = d1 - this.lastGoodY; - d8 = d2 - this.lastGoodZ; + d6 = d0 - this.lastGoodX; // Paper - diff on change, used for checking large move vectors above + d7 = d1 - this.lastGoodY; // Paper - diff on change, used for checking large move vectors above + d8 = d2 - this.lastGoodZ; // Paper - diff on change, used for checking large move vectors above boolean flag1 = d7 > 0.0D; if (this.player.onGround() && !packet.isOnGround() && flag1) {