!1485 [sync] PR-1452: media: dvb-core: Fix use-after-free due on race condition at dvb_net

Merge Pull Request from: @openeuler-sync-bot 
 

Origin pull request: 
https://gitee.com/openeuler/kernel/pulls/1452 
 
PR sync from: Cai Xinchen <caixinchen1@huawei.com>
https://mailweb.openeuler.org/hyperkitty/list/kernel@openeuler.org/message/KJPESWCJSTJOGG5KSTHLYL5PSDOGTFWW/ 
 
https://gitee.com/src-openeuler/kernel/issues/I635JD 
 
Link:https://gitee.com/openeuler/kernel/pulls/1485

 

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