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fix: adjust LDM params in estimate functions to prevent SIGFPE (issue #4590)

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Cody authored and Nick Terrell committed 2026-02-27 16:14:28 -05:00
1 parent 117b0edfae
commit 81cf153bce
2 files changed
+29 -2
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tests/fuzzer.c
+19
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@@ -2515,6 +2515,25 @@ static int basicUnitTests(U32 const seed, double compressibility)
}
}
DISPLAYLEVEL(3, "OK \n");
DISPLAYLEVEL(3, "test%3i : estimation functions with LDM enabled (issue #4590) : ", testNb++);
{
/* ZSTD_estimateCCtxSize_usingCCtxParams must adjust zeroed-out
* LDM parameters when LDM is enabled, to avoid division by zero
* in ZSTD_ldm_getMaxNbSeq. */
ZSTD_CCtx_params* params = ZSTD_createCCtxParams();
size_t cctxSize;
CHECK_Z(ZSTD_CCtxParams_setParameter(params, ZSTD_c_compressionLevel, 22));
CHECK_Z(ZSTD_CCtxParams_setParameter(params, ZSTD_c_enableLongDistanceMatching, ZSTD_ps_enable));
cctxSize = ZSTD_estimateCCtxSize_usingCCtxParams(params);
if (ZSTD_isError(cctxSize)) goto _output_error;
if (cctxSize == 0) goto _output_error;
cctxSize = ZSTD_estimateCStreamSize_usingCCtxParams(params);
if (ZSTD_isError(cctxSize)) goto _output_error;
if (cctxSize == 0) goto _output_error;
ZSTD_freeCCtxParams(params);
}
DISPLAYLEVEL(3, "OK \n");
}
free(staticCCtxBuffer);
free(staticDCtxBuffer);