!10315 jfs: xattr: fix buffer overflow for invalid xattr

Merge Pull Request from: @ci-robot 
 
PR sync from: Xia Fukun <xiafukun@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/ZWGMGTUDYSD3UL4XSGH7BTU56NRVX4FD/ 
 
https://gitee.com/src-openeuler/kernel/issues/IAD0FK 
 
Link:https://gitee.com/openeuler/kernel/pulls/10315

 

Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>