!4267 ksmbd: fix slab-out-of-bounds in smb_strndup_from_utf16()

Merge Pull Request from: @ci-robot 
 
PR sync from: ZhaoLong Wang <wangzhaolong1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/IOBXTFBVAGZSNG3WMPTIAT6KS35OMEOW/ 
 
https://gitee.com/src-openeuler/kernel/issues/I8YD63 
 
Link:https://gitee.com/openeuler/kernel/pulls/4267

 

Reviewed-by: Zheng Zengkai <zhengzengkai@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>