Fix : rare bugs when hashLog < min in bt mode

diff --git a/lib/zstd_compress.c b/lib/zstd_compress.c
index 31d81ea2ac0d84aad771c791b60ce7b2e4e5b5e6..65d7258d9e87158dc51865e52b56cc89e7cc259c 100644 (file)
--- a/lib/zstd_compress.c
+++ b/lib/zstd_compress.c
@@ -193,6 +193,7 @@ void ZSTD_adjustCParams(ZSTD_compressionParameters* params, U64 srcSize, size_t
         if (params->contentLog > maxContentLog) params->contentLog = maxContentLog; }   /* <= ZSTD_CONTENTLOG_MAX */
 
     if (params->windowLog  < ZSTD_WINDOWLOG_ABSOLUTEMIN) params->windowLog = ZSTD_WINDOWLOG_ABSOLUTEMIN;  /* required for frame header */
+    if ((params->hashLog  < ZSTD_HASHLOG_MIN) && ((U32)params->strategy >= (U32)ZSTD_btlazy2)) params->hashLog = ZSTD_HASHLOG_MIN;  /* required to ensure collision resistance in bt */
 }