[rpc] Bound length-delimited field length against readable bytes - #3756
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wuchong
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Thanks @fresh-borzoni , LGMT.
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closes #3757
Generated Protobuf decoders allocate
new byte[len]for a length-delimited field before checking the declared length fits the bytes present, so a bogus length prefix results in a large allocation.Added
ProtoCodecUtils.readBytesLen, which rejects a length that is negative or larger than the buffer's readable bytes, and route the bytes, string, repeated-bytes and repeated-string decoders through it.