!1585 ksmbd: fix global-out-of-bounds in smb2_find_context_vals

Merge Pull Request from: @ci-robot 
 
PR sync from: Long Li <leo.lilong@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/WWGP5YIJCFVLQK67BM5AROHE2XTHIAJ3/ 
 
https://gitee.com/src-openeuler/kernel/issues/I7LU2N 
 
Link:https://gitee.com/openeuler/kernel/pulls/1585

 

Reviewed-by: Jialin Zhang <zhangjialin11@huawei.com>
Signed-off-by: Jialin Zhang <zhangjialin11@huawei.com>