iemejia opened a new pull request, #3847:
URL: https://github.com/apache/avro/pull/3847
## What is the purpose of the change
When decoding an array or map, the block count is read from the input and
drives
allocation of the resulting collection. A very large or malformed block count
(for example from truncated or hostile input) could request an unbounded
allocation, since items such as `null` occupy no bytes on the wire.
This validates the block count — per block and cumulatively — against a
configurable maximum before allocating, mirroring the Java SDK's collection
item
limit (`org.apache.avro.limits.collectionItems.maxLength`, AVRO-3819). The
limit
defaults to `2^31 - 8` items and can be overridden with the
`AVRO_MAX_COLLECTION_ITEMS` environment variable, or by setting
`$Avro::BinaryDecoder::MAX_COLLECTION_ITEMS`. Exceeding it throws
`Avro::BinaryDecoder::Error::CollectionSize`.
This is part of the umbrella issue AVRO-4277.
## Verifying this change
This change added tests and can be verified as follows:
- Added `lang/perl/t/06_bin_decode_limits.t` covering: a single block count
above
the limit (array and map), a cumulative limit across blocks, a negative
block
count bounded by its absolute value, and a within-limit collection still
decoding correctly.
- Run: `cd lang/perl && prove -Ilib t/`
## 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_COLLECTION_ITEMS` environment variable is documented in code
comments)
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