Ensure the buffer for plugin messages is freed.

nms-patches/PlayerConnection.patch

@@ -1425,7 +1425,15 @@
          ArrayList arraylist = Lists.newArrayList();
          Iterator iterator = this.minecraftServer.tabCompleteCommand(this.player, packetplayintabcomplete.a(), packetplayintabcomplete.b()).iterator();
  
-@@ -921,13 +1884,16 @@
+@@ -905,6 +1868,7 @@
+         ItemStack itemstack;
+         ItemStack itemstack1;
+ 
++        try { // CraftBukkit
+         if ("MC|BEdit".equals(packetplayincustompayload.a())) {
+             packetdataserializer = new PacketDataSerializer(Unpooled.wrappedBuffer(packetplayincustompayload.b()));
+ 
+@@ -921,13 +1885,16 @@
                  itemstack1 = this.player.inventory.getItemInHand();
                  if (itemstack1 != null) {
                      if (itemstack.getItem() == Items.WRITABLE_BOOK && itemstack.getItem() == itemstack1.getItem()) {
@@ -1442,7 +1450,7 @@
                  return;
              } finally {
                  packetdataserializer.release();
-@@ -950,16 +1916,21 @@
+@@ -950,16 +1917,21 @@
                  itemstack1 = this.player.inventory.getItemInHand();
                  if (itemstack1 != null) {
                      if (itemstack.getItem() == Items.WRITTEN_BOOK && itemstack1.getItem() == Items.WRITABLE_BOOK) {
@@ -1464,7 +1472,7 @@
                  return;
              } finally {
                  packetdataserializer.release();
-@@ -976,11 +1947,12 @@
+@@ -976,11 +1948,12 @@
                  }
              } catch (Exception exception2) {
                  PlayerConnection.c.error("Couldn\'t select trade", exception2);
@@ -1478,7 +1486,7 @@
                  packetdataserializer = packetplayincustompayload.b();
  
                  try {
-@@ -1016,6 +1988,7 @@
+@@ -1016,6 +1989,7 @@
                      }
                  } catch (Exception exception3) {
                      PlayerConnection.c.error("Couldn\'t set command block", exception3);
@@ -1486,7 +1494,7 @@
                  } finally {
                      packetdataserializer.release();
                  }
-@@ -1041,6 +2014,7 @@
+@@ -1041,6 +2015,7 @@
                      }
                  } catch (Exception exception4) {
                      PlayerConnection.c.error("Couldn\'t set beacon", exception4);
@@ -1494,7 +1502,7 @@
                  }
              }
          } else if ("MC|ItemName".equals(packetplayincustompayload.a()) && this.player.activeContainer instanceof ContainerAnvil) {
-@@ -1056,7 +2030,28 @@
+@@ -1056,7 +2031,35 @@
                  containeranvil.a("");
              }
          }
@@ -1515,6 +1523,13 @@
 +            server.getMessenger().dispatchIncomingMessage(player.getBukkitEntity(), packetplayincustompayload.a(), data);
 +        }
 +        // CraftBukkit end
++        // CraftBukkit start
++        } finally {
++            if (packetplayincustompayload.b().refCnt() > 0) {
++                packetplayincustompayload.b().release();
++            }
++        }
++        // CraftBukkit end
 +    }
  
 +    // CraftBukkit start - Add "isDisconnected" method