iemejia opened a new pull request, #3850: URL: https://github.com/apache/avro/pull/3850
## What is the purpose of the change The deflate and bzip2 codecs are inflated incrementally and rejected once the output would exceed the limit; snappy rejects an over-large declared length up front; zstandard caps its streaming loop. Exceeding the limit raises `avro.errors.AvroDecompressionSizeException`. When reading a data file, each block is decompressed according to the file's codec. A block with a very high compression ratio (or a malformed block) could expand to far more memory than its compressed size (a decompression bomb). This enforces a configurable maximum decompressed size while reading each block, mirroring the Java SDK's decompression limit (AVRO-4247). The limit defaults to 200 MiB and can be overridden with the `AVRO_MAX_DECOMPRESS_LENGTH` environment variable. This is part of the umbrella issue AVRO-4283. ## Verifying this change This change added tests and can be verified as follows: - Added `avro/test/test_codecs.py` (`TestDecompressionSizeLimit`) covering deflate and bzip2 over-limit rejection and within-limit decoding (snappy/zstandard covered when those optional deps are installed). - Run: `cd lang/py && python3 -m unittest avro.test.test_codecs` ## Documentation - Does this pull request introduce a new feature? (no — hardening/robustness) - If yes, how is the feature documented? (not applicable; the new `AVRO_MAX_DECOMPRESS_LENGTH` environment variable is documented in code comments) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
