Scissors/patches/server/0045-Add-depth-limit-to-SNBT.patch

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2023-06-02 22:07:55 +00:00
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Allink <arclicious@vivaldi.net>
Date: Fri, 2 Jun 2023 22:13:54 +0100
Subject: [PATCH] Add depth limit to SNBT
diff --git a/src/main/java/net/minecraft/nbt/TagParser.java b/src/main/java/net/minecraft/nbt/TagParser.java
index fbfe810e8be6cb159742f7fd85e7491b9cefa4dc..b70bafe2766efcbcce00287e6511a588560564a6 100644
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--- a/src/main/java/net/minecraft/nbt/TagParser.java
+++ b/src/main/java/net/minecraft/nbt/TagParser.java
@@ -169,9 +169,56 @@ public class TagParser {
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}
this.expect('}');
- return compoundTag;
+ return exceedsDepthLimit(compoundTag) ? new CompoundTag() : compoundTag; // Scissors - Add depth limit to SNBT
}
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+ // Scissors start - Add depth limit to SNBT
+ private boolean exceedsDepthLimit(Tag tag) {
+ return this.exceedsDepthLimit(0, tag);
+ }
+
+ private boolean exceedsDepthLimit(long depth, Tag tag)
+ {
+ if (depth > 256)
+ {
+ return true;
+ }
+
+ if (tag instanceof ListTag listTag)
+ {
+ for (Tag childTag : listTag)
+ {
+ boolean returnValue = this.exceedsDepthLimit(depth + 1, childTag);
+
+ if (returnValue)
+ {
+ return true;
+ }
+ }
+ } else if (tag instanceof CompoundTag compoundTag)
+ {
+ for (String key: compoundTag.getAllKeys())
+ {
+ Tag childTag = compoundTag.get(key);
+
+ if (childTag == null)
+ {
+ continue;
+ }
+
+ boolean returnValue = this.exceedsDepthLimit(depth + 1, childTag);
+
+ if (returnValue)
+ {
+ return true;
+ }
+ }
+ }
+
+ return false;
+ }
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+ // Scissors end
+
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private Tag readListTag() throws CommandSyntaxException {
this.expect('[');
this.reader.skipWhitespace();
@@ -203,7 +250,7 @@ public class TagParser {
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}
this.expect(']');
- return listTag;
+ return exceedsDepthLimit(listTag) ? new ListTag() : listTag; // Scissors - Add depth limit to SNBT
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}
}
@@ -228,7 +275,7 @@ public class TagParser {
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}
private <T extends Number> List<T> readArray(TagType<?> arrayTypeReader, TagType<?> typeReader) throws CommandSyntaxException {
- List<T> list = Lists.newArrayList();
+ List<Number> list = Lists.newArrayList(); // Scissors - List<T> -> List<Number>
while(true) {
if (this.reader.peek() != ']') {
@@ -241,11 +288,11 @@ public class TagParser {
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}
if (typeReader == ByteTag.TYPE) {
- list.add((T)((NumericTag)tag).getAsByte());
+ list.add(((NumericTag)tag).getAsByte()); // Scissors - Remove (T) cast
} else if (typeReader == LongTag.TYPE) {
- list.add((T)((NumericTag)tag).getAsLong());
+ list.add(((NumericTag)tag).getAsLong()); // Scissors - Remove (T) cast
} else {
- list.add((T)((NumericTag)tag).getAsInt());
+ list.add(((NumericTag)tag).getAsInt()); // Scissors - Remove (T) cast
}
if (this.hasElementSeparator()) {
@@ -257,7 +304,7 @@ public class TagParser {
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}
this.expect(']');
- return list;
+ return (List<T>) list; // Scissors - Cast to List<T>
}
}