1 files changed, 94 insertions, 0 deletions
diff --git a/patches/server/0673-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch b/patches/server/0673-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch
new file mode 100644
index 0000000000..4d74f60751
--- /dev/null
+++ b/patches/server/0673-Only-write-chunk-data-to-disk-if-it-serializes-witho.patch
@@ -0,0 +1,94 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Spottedleaf <[email protected]>
+Date: Sun, 19 Dec 2021 09:13:41 -0800
+Subject: [PATCH] Only write chunk data to disk if it serializes without
+ throwing
+
+This ensures at least a valid version of the chunk exists
+on disk, even if outdated
+
+diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
+index 140d6e455c1729f6e31e95facba5520b75ad838c..169e375c814ff814d15101d09dccc67783f50465 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFile.java
+@@ -420,6 +420,7 @@ public class RegionFile implements AutoCloseable {
+ 
+     }
+ 
++    public static final int MAX_CHUNK_SIZE = 500 * 1024 * 1024; // Paper - don't write garbage data to disk if writing serialization fails
+     private class ChunkBuffer extends ByteArrayOutputStream {
+ 
+         private final ChunkPos pos;
+@@ -433,6 +434,23 @@ public class RegionFile implements AutoCloseable {
+             super.write(RegionFile.this.version.getId());
+             this.pos = chunkcoordintpair;
+         }
++        // Paper start - don't write garbage data to disk if writing serialization fails
++        @Override
++        public void write(final int b) {
++            if (this.count > MAX_CHUNK_SIZE) {
++                throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + this.count);
++            }
++            super.write(b);
++        }
++
++        @Override
++        public void write(final byte[] b, final int off, final int len) {
++            if (this.count + len > MAX_CHUNK_SIZE) {
++                throw new RegionFileStorage.RegionFileSizeException("Region file too large: " + (this.count + len));
++            }
++            super.write(b, off, len);
++        }
++        // Paper end - don't write garbage data to disk if writing serialization fails
+ 
+         public void close() throws IOException {
+             ByteBuffer bytebuffer = ByteBuffer.wrap(this.buf, 0, this.count);
+diff --git a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
+index b5b7b73048eaadfe58961631427da7574d42f5e8..fa086a19f038b929f356292b2f657929765f7b6f 100644
+--- a/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
++++ b/src/main/java/net/minecraft/world/level/chunk/storage/RegionFileStorage.java
+@@ -145,10 +145,17 @@ public class RegionFileStorage implements AutoCloseable {
+ 
+             try {
+                 NbtIo.write(nbt, (DataOutput) dataoutputstream);
++                // Paper start - don't write garbage data to disk if writing serialization fails
++                dataoutputstream.close(); // Only write if successful
++            } catch (final RegionFileSizeException e) {
++                attempts = 5; // Don't retry
++                regionfile.clear(pos);
++                throw e;
++                // Paper end - don't write garbage data to disk if writing serialization fails
+             } catch (Throwable throwable) {
+                 if (dataoutputstream != null) {
+                     try {
+-                        dataoutputstream.close();
++                        //dataoutputstream.close(); // Paper - don't write garbage data to disk if writing serialization fails
+                     } catch (Throwable throwable1) {
+                         throwable.addSuppressed(throwable1);
+                     }
+@@ -156,10 +163,7 @@ public class RegionFileStorage implements AutoCloseable {
+ 
+                 throw throwable;
+             }
+-
+-            if (dataoutputstream != null) {
+-                dataoutputstream.close();
+-            }
++            // Paper - don't write garbage data to disk if writing serialization fails; move into try block to only write if successfully serialized
+         }
+         // Paper start - Chunk save reattempt
+                 return;
+@@ -202,4 +206,13 @@ public class RegionFileStorage implements AutoCloseable {
+         }
+ 
+     }
++
++    // Paper start - don't write garbage data to disk if writing serialization fails
++    public static final class RegionFileSizeException extends RuntimeException {
++
++        public RegionFileSizeException(String message) {
++            super(message);
++        }
++    }
++    // Paper end - don't write garbage data to disk if writing serialization fails
+ }