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Checking that payload length is positive on packets reading (#1211)

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Konstantin Shandurenko 2022-07-07 05:18:24 +03:00 committed by GitHub
parent 4884051c6a
commit 0c6599fee6
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1 changed files with 3 additions and 0 deletions
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src/main/java/net/minestom/server/utils/PacketUtils.java
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@ -172,6 +172,9 @@ public final class PacketUtils {
if (compressed) { if (compressed) {
final int dataLength = readBuffer.readVarInt(); final int dataLength = readBuffer.readVarInt();
final int payloadLength = packetLength - (readBuffer.readerOffset() - readerStart); final int payloadLength = packetLength - (readBuffer.readerOffset() - readerStart);
if (payloadLength < 0) {
throw new DataFormatException("Negative payload length " + payloadLength);
}
if (dataLength == 0) { if (dataLength == 0) {
// Data is too small to be compressed, payload is following // Data is too small to be compressed, payload is following
decompressedSize = payloadLength; decompressedSize = payloadLength;