!6478 do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

Merge Pull Request from: @ci-robot 
 
PR sync from: ZhaoLong Wang <wangzhaolong1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/AGQVNJUXKQII3ZI7TRGG7IHD3MB4HPSI/ 
 
https://gitee.com/src-openeuler/kernel/issues/I9HK1I 
 
Link:https://gitee.com/openeuler/kernel/pulls/6478

 

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