support-6913

[*] Last DAP SDK fixes ported from master

3rdparty/cuttdb/src/cdb_core.c

@@ -41,6 +41,9 @@ static void _cdb_pagewarmup(CDB *db, bool loadbf);
 /* it isn't necessary to rehash bid in hash table cache */
 static uint32_t _pagehash(const void *key, int len)
 {
+    uint32_t tst = 0;
+    if (len < tst)
+        return 0;
     (void) len;
     return *(uint32_t*)key;
 }