Files
bun.sh/test/regression
robobun 9902039b1f fix: memory leaks in error-handling code for Brotli, Zstd, and Zlib compression state machines (#25592)
## Summary

Fix several memory leaks in the compression libraries:

- **NativeBrotli/NativeZstd reset()** - Each call to `reset()` allocated
a new encoder/decoder without freeing the previous one
- **NativeBrotli/NativeZstd init() error paths** - If `setParams()`
failed after `stream.init()` succeeded, the instance was leaked
- **NativeZstd init()** - If `setPledgedSrcSize()` failed after context
creation, the context was leaked
- **ZlibCompressorArrayList** - After `deflateInit2_()` succeeded, if
`ensureTotalCapacityPrecise()` failed with OOM, zlib internal state was
never freed
- **NativeBrotli close()** - Now sets state to null to prevent potential
double-free (defensive)
- **LibdeflateState** - Added `deinit()` for API consistency

## Test plan

- [x] Added regression test that calls `reset()` 100k times and measures
memory growth
- [x] Test shows memory growth dropped from ~600MB to ~10MB for Brotli
- [x] Verified no double-frees by tracing code paths
- [x] Existing zlib tests pass (except pre-existing timeout in debug
build)

Before fix (system bun 1.3.3):
```
Memory growth after 100000 reset() calls: 624.38 MB  (BrotliCompress)
Memory growth after 100000 reset() calls: 540.63 MB  (BrotliDecompress)
```

After fix:
```
Memory growth after 100000 reset() calls: 11.84 MB   (BrotliCompress)
Memory growth after 100000 reset() calls: 0.16 MB    (BrotliDecompress)
```

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
2025-12-18 21:42:14 -08:00
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