!9492 netlabel: fix out-of-bounds memory accesses

Merge Pull Request from: @ci-robot 
 
PR sync from: Yue Haibing <yuehaibing@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/5E2BGXEFPS36QMACC2KFKXKQS46GR7ZN/ 
 
https://gitee.com/openeuler/kernel/issues/IA8H5C 
 
Link:https://gitee.com/openeuler/kernel/pulls/9492

 

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