write::BzDecoder: Fix infinite loop on drop when no data is read or written #118
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…ritten If writes to the BzDecoder end before it has been fed the entire stream and the output buffer has already been flushed to the wrapped writer, then the Drop implementation will loop forever. On drop, try_finish() is called, which repeatedly tries to write() until BZ_STREAM_END is returned or an error occurs, but neither scenario happens if there's no input nor output data to process. This commit makes try_finish() return an UnexpectedEof error in this scenario. Signed-off-by: Andrew Gunnerson <[email protected]>
folkertdev
reviewed
Dec 16, 2024
| let _ = self.write(&[])?; | ||
| // The write is effectively a `self.flush()`, but we want to know how many | ||
| // bytes were written. exit if no input was read and no output was written | ||
| if self.write(&[])? == 0 { |
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I removed the self.total_in() == read_before check here because on self.write(&[])? there is no way (unless I'm really missing something) that total_in could change: that empty input buffer is handed to decompress_vec, which ultimately calls BZ2_bzDecompress with an empty input buffer. total_in will not change in that case, how could it?
bjorn3
approved these changes
Dec 16, 2024
Co-authored-by: bjorn3 <[email protected]>
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Thanks for improving the PR and merging it! |
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If writes to the
BzDecoderend before it has been fed the entire stream and the output buffer has already been flushed to the wrapped writer, then theDropimplementation will loop forever. On drop,try_finish()is called, which repeatedly tries towrite()untilBZ_STREAM_ENDis returned or an error occurs, but neither scenario happens if there's no input nor output data to process.This commit makes
try_finish()return anUnexpectedEoferror in this scenario.(Also, really happy to see this library found a new maintainer!)