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Test bufsize values of 0 and -1 in decompress() - #307
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rhpvorderman merged 1 commit intoNov 2, 2026
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isal_zlib.decompress() and igzip_lib.decompress() turn a bufsize of 0 into 1 and reject a negative bufsize, as zlib.decompress() does. No test used those values. Without the first check, a bufsize of 0 makes decompress() loop forever.
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isal_zlib.decompress()andigzip_lib.decompress()turn abufsizeof 0 into 1 and raiseValueErrorfor a negativebufsize, aszlib.decompress()does. No test used those values. This PR adds a test for both functions.To test it, I removed each of the two checks in
igzip_lib_decompress_impl()inisal_shared.h. All tests intests/test_compat.pyondevelopstill pass. Without the line that turns 0 into 1, the output buffer starts at 0 bytes and doubling it leaves it at 0, sodecompress()never returns, and the new test doesn't finish (I stopped it after 20 s). Without the check for negative values, the new test fails withSystemError.This PR changes only tests, so it has no CHANGELOG entry.
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