iemejia opened a new pull request, #3852: URL: https://github.com/apache/avro/pull/3852
## What is the purpose of the change The built-in deflate codec passes the limit to zlib (via `maxOutputLength`) so the allocation itself is capped, and every codec's output is additionally checked as a safeguard. The limit can also be set per decoder via the `maxDecompressLength` option. 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 tests in `lib/test/test_files.js`: a deflate block exceeding the limit is rejected, a within-limit block decodes, and the limit is enforced for custom codecs. - Run: `cd lang/js && npm test` ## 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]
