two overrun bug in ev.c & easy_mem_slab.c

deps/easy/src/io/ev.c

@@ -1274,8 +1274,8 @@ EV_CPP(extern "C" {
 #endif
         WL                      head;
     } ANSIG;
-
-    static ANSIG signals [EV_NSIG - 1];
+    //whitescan for safety hole check
+    static ANSIG signals [EV_NSIG];
 
     /*****************************************************************************/
 

deps/easy/src/memory/easy_mem_slab.c

@@ -278,8 +278,9 @@ static void* easy_mem_cache_grow(easy_mem_cache_t* cache)
   for (i = 0; i < cache->num; i++) {
     slab->next_pos[i] = i + 1;
   }
-
-  slab->next_pos[i - 1] = EASY_MEM_POS_END;
+  // for static safty hole check, i is uint32_t
+  // when i-1,i=0->0-1=unsigned(-1),convert -1 to unsigned as result may overflow
+  if(i>0) slab->next_pos[i - 1] = EASY_MEM_POS_END;
   cache->free_objects += cache->num;
 
   obj = easy_mem_slab_get_obj(cache, slab);