!7477 firewire: nosy: ensure user_length is taken into account when fetching packet contents

Merge Pull Request from: @ci-robot 
 
PR sync from: Hongbo Li <lihongbo22@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/BBOU6WXOS2AMSVF6EVGKBO5YGK3VV3QG/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9OZA3 
 
Link:https://gitee.com/openeuler/kernel/pulls/7477

 

Reviewed-by: Liu YongQiang <liuyongqiang13@huawei.com>
Reviewed-by: Zhang Jianhua <chris.zjh@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>