Frantisek Sumsal
35eb598af2
If a journal file contains a truncated ZSTD frame (i.e. a frame with Frame_Content_Size > 0, but with not enough data in Data_Block), ZSTD_decompressStream() would return a non-zero, non-error value. This would then skip the error path in the ZSTD_isError() branch and we'd hit the following assert: $ build-local/journalctl -o cat --file zstd-truncated.journal Assertion 'output.pos >= prefix_len + 1' failed at src/basic/compress.c:1236, function decompress_startswith_zstd(). Aborting. Aborted (core dumped) build-local/journalctl -o cat --file zstd-truncated.journal Let's handle this situation gracefully and return EBADMSG instead. Also, add another journalctl invocation to the corrupted-journals test that goes through the sd_journal_get_data() -> decompress_startswith_zstd() code path which, among other things, covers the issue when run on the provided journal file.
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