Fix #1861: Restrict overlapLog Parameter When Not Built With Multithreading

This parameter is unused in single-threaded compression. We should make it
behave like the other multithread-only parameters, for which we only accept
zero when we are not built with multithreading.

diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 35346b92cb1afaf3f02c4b9fab07915521949dbc..edeac4b950225be1195226b1182aa0693ed31d11 100644 (file)
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -339,8 +339,13 @@ ZSTD_bounds ZSTD_cParam_getBounds(ZSTD_cParameter param)
         return bounds;
 
     case ZSTD_c_overlapLog:
+#ifdef ZSTD_MULTITHREAD
         bounds.lowerBound = ZSTD_OVERLAPLOG_MIN;
         bounds.upperBound = ZSTD_OVERLAPLOG_MAX;
+#else
+        bounds.lowerBound = 0;
+        bounds.upperBound = 0;
+#endif
         return bounds;
 
     case ZSTD_c_enableLongDistanceMatching: