Description of problem: compressing an empty bytestring violates memory safety Version-Release number of selected component: * python3-zstd-1.4.5.1-6.fc36.x86_64 * python3-zstd-1.4.5.1-8.fc37.x86_64 How reproducible: reliably Steps to Reproduce: 1. python3 -c "import zstd; print(repr(zstd.compress(b'')))" 2. valgrind --track-origins=yes python3 -c "import zstd; print(repr(zstd.compress(b'')))" > valgrind.log Actual results (Fedora 36): b"\xe4\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 \x00'ModuleSpec' object has no attribute '_initializ" Actual results (Fedora 37): b'\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 \x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00 \x00\x00\x00\x00' Expected results: b'(\xb5/\xfd \x00\x01\x00\x00' Additional info: https://github.com/sergey-dryabzhinsky/python-zstd/releases/tag/v1.5.2.6 should have the fix
Created attachment 1930155 [details] valgrind log obtained on Fedora 37
This is not a security issue. No memory boundary looks to be crossed here. The issue here is that python-zstd was using a deprecated function ZSTD_getDecompressedSize() which is obseleted and replaced by ZSTD_getFrameContentSize() in zstd. Instead of failing after ZSTD_getDecompressedSize() returns a 0, python-zstd continued to attempt to compress the data since it may be compressable but have an unknown content size which would make it necessary to use streaming mode. Eventually this returns the smallest size frame returned by ZSTD_COMPRESSBOUND(). As Alexander mentions, this is resolved in 1.5.2.6.
ack. Will prioritize getting this updated, thanks!
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