diff --git a/common/src/io_uring.cpp b/common/src/io_uring.cpp
index d93fe37..e9af2f4 100644
--- a/common/src/io_uring.cpp
+++ b/common/src/io_uring.cpp
@@ -63,12 +63,6 @@ static void user_data_destory(struct user_data *data)
 {
     if (data)
     {
-        if (data->vec.iov_base)
-        {
-            free(data->vec.iov_base);
-            data->vec.iov_base = NULL;
-        }
-
         free(data);
         data = NULL;
     }
@@ -76,8 +70,8 @@ static void user_data_destory(struct user_data *data)
 
 static struct user_data *user_data_create(int buff_size)
 {
-    struct user_data *data = (struct user_data *)calloc(1, sizeof(struct user_data));
-    data->vec.iov_base = (void *)calloc(buff_size, sizeof(char));
+    struct user_data *data = (struct user_data *)calloc(1, sizeof(struct user_data) + buff_size * sizeof(char));
+    data->vec.iov_base = (void *)data + sizeof(struct user_data);
     data->vec.iov_len = buff_size;
 
     return data;