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Allow ZSTD_selectBlockCompressor() to Return NULL

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Return an error rather than segfaulting.
This commit is contained in:
W. Felix Handte
2023-05-04 12:18:58 -04:00
parent 7806d80338
commit cbf3e26316
2 changed files with 13 additions and 6 deletions
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lib/compress/zstd_compress.c
+11 -6
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@@ -3280,22 +3280,27 @@ static size_t ZSTD_buildSeqStore(ZSTD_CCtx* zc, const void* src, size_t srcSize)
}
/* Fallback to software matchfinder */
{ ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
{ ZSTD_blockCompressor const blockCompressor =
ZSTD_selectBlockCompressor(
zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
ms->ldmSeqStore = NULL;
DEBUGLOG(
5,
"External sequence producer returned error code %lu. Falling back to internal parser.",
(unsigned long)nbExternalSeqs
);
RETURN_ERROR_IF(blockCompressor == NULL, parameter_combination_unsupported, "Got NULL block compressor!");
lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
} }
} else { /* not long range mode and no external matchfinder */
ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
ZSTD_blockCompressor const blockCompressor = ZSTD_selectBlockCompressor(
zc->appliedParams.cParams.strategy,
zc->appliedParams.useRowMatchFinder,
dictMode);
ms->ldmSeqStore = NULL;
RETURN_ERROR_IF(blockCompressor == NULL, parameter_combination_unsupported, "Got NULL block compressor!");
lastLLSize = blockCompressor(ms, &zc->seqStore, zc->blockState.nextCBlock->rep, src, srcSize);
}
{ const BYTE* const lastLiterals = (const BYTE*)src + srcSize - lastLLSize;