This full fill all the new memory with zeroes.

src/osdp_cp.c

@@ -1399,6 +1399,7 @@ static int cp_add_pd(struct osdp *ctx, int new_num_pd, const osdp_pd_info_t *new
         LOG_PRINT("Failed to allocate new osdp_pd[] context");
         return -1;
     }
+	bzero(&ctx->pd[sizeof(struct osdp_pd) * old_num_pd], sizeof(struct osdp_pd) * new_num_pd);
 
     ctx->pd = new_pd_array;
     ctx->_num_pd = old_num_pd + new_num_pd;